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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A ordinary shares subject to possible redemption, 17,250,000 shares issued and outstanding at redemption value of $10.38 and $10.20 per share as of June 30, 2026 and December 31, 2025, respectively</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Carrying Amount, Attributable to Parent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityNumberOfSharesRedemptionValueAndOtherDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plus:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityNumberOfSharesRedemptionValueAndOtherDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Other Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ScheduleOfBasicAndDilutedNetIncomeLossPerOrdinaryShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Basic and Diluted Net Income (Loss) Per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsAttributableToParentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Numerator:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsAttributableToParentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allocation of net income (loss), as adjusted, Basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Basic, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allocation of net income (loss), as adjusted , Diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Diluted, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Diluted weighted average Ordinary Shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted - Weighted average shares outstanding of ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Diluted net income (loss) per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted- net income (loss) per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Diluted, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasicLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Basic and Diluted Net Income (Loss) Per Ordinary Share [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasicLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Denominator:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">RELATED PARTY TRANSACTIONS</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_FairValueOfFounderShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of founder shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_FairValueOfFounderShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value of Founder Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_FairValueOfFounderShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value of founder shares.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_FounderSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Founder Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_FounderSharesMembershipInterestsHoldersValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Founder Shares Membership Interests Holders, Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_FounderSharesMembershipInterestsHoldersValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Founder Shares Membership Interests Holders, Value.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trading days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Consecutive Trading Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of consecutive trading days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfSharesNoLongerSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares no longer subject to forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfSharesNoLongerSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/label">NumberOfSharesNoLongerSubjectToForfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfSharesNoLongerSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares no longer subject to forfeiture.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_RelatedPartyTransactionsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_SponsorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sponsor [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_SponsorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sponsor [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WorkingCapitalLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Working Capital Loans [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_DirectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Director [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Basic net income (loss) per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic- net income (loss) per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/disclosureGuidance">Class B [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class B ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Class B ordinary shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassBMember_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Class B</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Class B [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/disclosureGuidance">Class A [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Class A Ordinary Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Class A</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Class A [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ScheduleOfBasicAndDilutedNetIncomeLossPerOrdinaryShareDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Basic and Diluted Net Income (Loss) Per Ordinary Share [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ScheduleOfBasicAndDilutedNetIncomeLossPerOrdinaryShareDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Basic and Diluted Net Income (Loss) Per Ordinary Share (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate loan amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Face Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Price of warrant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Price per warrant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/definitionGuidance">Exercise price per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Exercise Price of Warrants or Rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title and Position [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfRelatedPartyDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding balance loan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfRelatedPartyDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayments of Related Party Debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related and Nonrelated Parties [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party Transactions [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAmountsOfTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment per month</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAmountsOfTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction, Amounts of Transaction</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related and Nonrelated Parties [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from (Repayments of) Debt, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForFees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Incurred fees services</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForFees_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for Other Fees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preference shares, shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preference shares, shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Combination [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Series of Individually Immaterial Business Combinations [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redemption price per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right Redemption of Warrants or Rights Stock Price Trigger</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Class of Warrant or Right Redemption of Warrants or Rights Stock Price Trigger.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassOfWarrantOrRightExercisableEntityMayRedeemRedemptionWrittenNoticePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Written notice</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassOfWarrantOrRightExercisableEntityMayRedeemRedemptionWrittenNoticePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">class of warrant or right exercisable entity may redeem redemption written notice period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassOfWarrantOrRightExercisableEntityMayRedeemRedemptionWrittenNoticePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Class of warrant or right exercisable entity may redeem redemption written notice period.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SHAREHOLDERS&#8217; DEFICIT</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shareholders&#8217; Deficit [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Price per unit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate amount of option exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Stock Options Exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OverAllotmentOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Over-Allotment Option [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherCommitmentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and Contingency [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherCommitmentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Commitments [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IPOMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">IPO [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IPOMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial Public Offering [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingency [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Additional units purchased</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Units sold</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Units Issued During Period Shares New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of new units issued during the period.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Voting percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Voting Equity Interest Acquired, Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination issue price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Price Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic - Weighted average shares outstanding of ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Basic weighted average Ordinary Shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings (Accumulated Deficit), Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities, Class A Ordinary Shares subject to Possible Redemption, and Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Expense, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Value, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and Contingency (Note 6)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsHeldInTrustNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Marketable securities held in Trust Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsHeldInTrustNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset, Held-in-Trust, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional paid-in capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid in Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PublicSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Public Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement Warrants [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfPublicSharesToBeRedeemedOnNonCompletionOfBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of public shares to be redeemed on business combination</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfPublicSharesToBeRedeemedOnNonCompletionOfBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Public Shares to be Redeemed on Non Completion of Business Combination</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfPublicSharesToBeRedeemedOnNonCompletionOfBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of public shares to be redeemed on non completion of business combination.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">General and administrative costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">General and administrative costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">General and Administrative Expense, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Price per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Price per unit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Price Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Components [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/disclosureGuidance">Shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/definitionGuidance">Number of founders shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of units issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares subject to forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash held in interest-bearing operating bank account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash &#8211; End of the period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash &#8211; Beginning of the period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Local Phone Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Central Index Key</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, City or Town</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line Two</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Quarterly Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Year Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preference shares, shares authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preference shares, par value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Par or Stated Value Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockByClassTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock, Class of Stock [Table]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Number of Securities Called by Each Warrant or Right</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIncomeInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Interest earned on marketable securities held in Trust Account</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PaymentOfOperationCostsThroughPromissoryNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of expenses through promissory note &#8211; related party</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of CODM information</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USTreasurySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. Treasury Securities Money Market Fund [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PublicWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Public Warrants [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Axis]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesSubjectToMandatoryRedemptionChangesInRedemptionValuePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A Ordinary Shares Subject to Possible Redemption</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesSubjectToMandatoryRedemptionChangesInRedemptionValuePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Subject to Mandatory Redemption, Changes in Redemption Value, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Basic and Diluted Net Income (Loss) Per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration of Credit Risk</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk, Credit Risk, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Financial Instruments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivatives, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Income (Loss) Per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value of Financial Instruments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Summary of Significant Accounting Policies [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Marketable Securities Held in Trust Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Marketable Securities, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recent Accounting Standards</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Use of Estimates</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and Cash Equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Class A Ordinary Shares Subject to Possible Redemption</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_EmergingGrowthCompanyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Emerging Growth Company</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WarrantInstrumentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for warrant instruments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">FAIR VALUE MEASUREMENTS</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Company&#8217;s Assets That are Measured at Fair Value on a Recurring Basis</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets:</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents [Axis]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring and Nonrecurring [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, shares authorized</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of reportable segments</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredOfferingCostsAppliedToPrepaidServicesContributedBySponsor_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred offering costs applied to prepaid expense contributed by Sponsor</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredOfferingCostsAppliedToPrepaidServicesContributedBySponsor_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Offering Costs Applied to Prepaid Services Contributed by Sponsor</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredOfferingCostsAppliedToPrepaidServicesContributedBySponsor_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of deferred offering costs applied to prepaid services contributed by sponsor.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_Rule10b51ArrangementModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Rule 10b5-1 Arrangement Modified</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_Rule10b51ArrangementModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Rule 10b5-1 Arrangement Modified [Flag]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_Rule10b51ArrangementModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Rule 10b5-1 Arrangement Modified [Flag].</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NonRule10b51ArrangementModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-Rule 10b5-1 Arrangement Modified</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NonRule10b51ArrangementModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-Rule 10b5-1 Arrangement Modified [Flag]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NonRule10b51ArrangementModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non-Rule 10b5-1 Arrangement Modified [Flag].</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InvestmentMaturityDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investment maturity days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InvestmentMaturityDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment Maturity Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InvestmentMaturityDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Investment maturity days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Equivalents, at Carrying Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFDICInsuredAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal deposit insurance corporation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFDICInsuredAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, FDIC Insured Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrecognized tax benefits</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Tax Benefits</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title and Position [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WorkingCapitalLoanOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Working capital loan outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WorkingCapitalLoanOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Working Capital Loans Outstanding.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritingDiscountGrossProceedsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriting discount gross proceeds percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritingDiscountGrossProceedsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriting Discount Gross Proceeds Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritingDiscountGrossProceedsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of underwriting discount gross proceeds.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritersOptionFromProposedPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriters option period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritersOptionFromProposedPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriters Option From Proposed Public Offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritersOptionFromProposedPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Underwriters option from proposed public offering.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwritersAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriters&#8217; Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwriterCashDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash underwriting discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwriterCashDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriter Cash Discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnderwriterCashDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the cash underwriting discount per unit.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredUnderwritingDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred underwriting discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredUnderwritingDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Underwriting Discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredUnderwritingDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The percentage of deferred underwriting discount.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CommitmentsAndContingencyDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and Contingency [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CommitmentsAndContingencyDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingency (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CashUnderwritingDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash underwriting discount percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CashUnderwritingDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Underwriting Discount Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CashUnderwritingDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash underwriting discount rate.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">COMMITMENTS AND CONTINGENCY</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shareholders&#8217; Deficit [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Private Placement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Public Warrants outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Ordinary Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, par value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Par or Stated Value Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of votes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Voting Rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Component [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_MaximumPeriodAfterBusinessCombinationInWhichToFileRegistrationStatement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Event later business days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_MaximumPeriodAfterBusinessCombinationInWhichToFileRegistrationStatement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum Period After Business Combination in Which to File Registration Statement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_MaximumPeriodAfterBusinessCombinationInWhichToFileRegistrationStatement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Maximum Period After Business Combination In Which To File Registration Statement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of trading days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Trading Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of trading days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDaysCommencing_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of trading days commencing</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDaysCommencing_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of trading days Commencing</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDaysCommencing_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of trading days Commencing.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDaysCompletion_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of trading days completion</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDaysCompletion_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of trading days Completion</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfTradingDaysCompletion_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of trading days Completion.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfConversionOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of conversion of ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfConversionOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Conversion of Ordinary Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfConversionOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of conversion of ordinary shares.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfNewlyIssuedShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of newly issued shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfNewlyIssuedShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Newly Issued Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfNewlyIssuedShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of newly issued shares.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PeriodOfTimeWithInWhichRegistrationStatementIsExpectedToBecomeEffective_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effective business days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PeriodOfTimeWithInWhichRegistrationStatementIsExpectedToBecomeEffective_lbl" xlink:role="http://www.xbrl.org/2003/role/label">period of time with in which registration statement is expected to become effective</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PeriodOfTimeWithInWhichRegistrationStatementIsExpectedToBecomeEffective_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Period of time with in which registration statement is expected to become effective.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_RedemptionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Redemption period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_RedemptionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Redemption period.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ShareholdersDeficitEquityDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shareholders&#8217; (Deficit) Equity [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ShareholdersDeficitEquityDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shareholders&#8217; (Deficit) Equity (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WarrantsAndRightsOutstandingExercisableTermAfterBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Warrant exercisable term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WarrantsAndRightsOutstandingExercisableTermAfterBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants And Rights Outstanding, Exercisable Term After Business Combination</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WarrantsAndRightsOutstandingExercisableTermAfterBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The warrants exercisable term after the completion of a business combination.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_BusinessAcquisitionPercentageOfVotingInterestsToBeAcquiredOnPostTransactionEntityMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ownership interest to be acquired on post-transaction company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_BusinessAcquisitionPercentageOfVotingInterestsToBeAcquiredOnPostTransactionEntityMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition Percentage of Voting Interests to Be Acquired On Post Transaction Entity Minimum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_BusinessAcquisitionPercentageOfVotingInterestsToBeAcquiredOnPostTransactionEntityMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of business acquisition percentage of voting interests to be acquired on post transaction entity minimum.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of Organization and Business Operations [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of Organization and Business Operations [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_OtherOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_OtherOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Offering Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_OtherOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of other offering costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonoperating Income (Expense), Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other income:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonoperating Income (Expense) [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term prepaid insurance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Expense, Noncurrent, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredUnderwritingFees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred underwriting fees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredUnderwritingFees_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Underwriting Fees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DeferredUnderwritingFees_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of deferred underwriting fees.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_DescriptionOfOrganizationBusinessOperationsLiquidityAndCapitalResourcesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of Organization Business Operations Liquidity and Capital Resources [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InterestToBePayDissolutionExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest to be pay on dissolution expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InterestToBePayDissolutionExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest to be pay Dissolution Expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InterestToBePayDissolutionExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of interest to be pay dissolution expenses.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InvestmentsMaximumMaturityTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maturity term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InvestmentsMaximumMaturityTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments Maximum Maturity Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InvestmentsMaximumMaturityTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The maturity term of investments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares, Outstanding, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CashUnderwritingFees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash underwriting fees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CashUnderwritingFees_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Underwriting Fees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CashUnderwritingFees_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of cash underwriting fees.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Working capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Working Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of working capital.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfFairMarketValueEqualToNetBalanceInTrustAccount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of fair market value of trust account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfFairMarketValueEqualToNetBalanceInTrustAccount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Fair Market Value Equal to Net Balance in Trust Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PercentageOfFairMarketValueEqualToNetBalanceInTrustAccount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of fair market value equal to net balance in trust account.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Stockholders' Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preference shares, $0.0001 par value; 1,000,000 shares authorized; none issued or outstanding as of June 30, 2026 and December 31, 2025</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Value, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Tax Identification Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Symbol</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassAOrdinarySharesParValue00001PerShareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A Ordinary Shares, par value $0.0001 per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_ClassAOrdinarySharesParValue00001PerShareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class A Ordinary Shares, par value $0.0001 per share [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net income (loss)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net income (loss)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_AccruedOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_AccruedOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Offering Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_AccruedOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of accrued offering costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Liabilities, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net loss</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Income (Loss), Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Date of incorporation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, Date of Incorporation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValue_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accretion for Class A ordinary shares to redemption amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Accretion to Redemption Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred underwriting fee payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Compensation Liability, Classified, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Current Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Expiration term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding, Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquitySharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares subject to possible redemption, shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquitySharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Shares Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Share issued value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_RedeemableWarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Redeemable Warrant [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_TransactionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transaction costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_TransactionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transaction Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_TransactionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of transaction costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of Organization and Business Operations [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net proceeds</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance or Sale of Equity, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional Paid-in Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid-in Capital [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Common Stock, Shares Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_CantorFitzgeraldCoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cantor Fitzgerald Co [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Current Reporting Status</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityExTransitionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Ex Transition Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity File Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Shell Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnitsEachConsistingOfOneClassAOrdinaryShareAndOnequarterOfOneRedeemableWarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Units, each consisting of one Class A Ordinary Share and one-quarter of one Redeemable Warrant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_UnitsEachConsistingOfOneClassAOrdinaryShareAndOnequarterOfOneRedeemableWarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Units, each consisting of one Class A Ordinary Share and one-quarter of one Redeemable Warrant [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WarrantsEachWholeWarrantExercisableForOneClassAOrdinaryShareAtAnExercisePriceOf1150PerShareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_WarrantsEachWholeWarrantExercisableForOneClassAOrdinaryShareAtAnExercisePriceOf1150PerShareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InterestEarnedOnCashHeldInOperatingBankAccount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest earned on cash held in Operating Bank Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InterestEarnedOnCashHeldInOperatingBankAccount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Earned on Cash Held in Operating Bank Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_InterestEarnedOnCashHeldInOperatingBankAccount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of interest earned on cash held in operating bank account.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Performance and Making Key Decisions Regarding Resource Allocation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial Public Offering [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsidiary, Sale of Stock [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in operating assets and liabilities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accrued Liabilities, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-cash investing and financing activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Cash Flows [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_PrivatePlacementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfWarrantsIssuedPerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of warrants in a unit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="onch_NumberOfWarrantsIssuedPerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Warrants Issued Per Unit</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents [Domain]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from operating activities:</link:label>
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