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  <xsd:element abstract="true" id="eton_NdaApprovalByTheFdaAndFirstCommercialSaleMember" name="NdaApprovalByTheFdaAndFirstCommercialSaleMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_NitisinoneProductRightsMember" name="NitisinoneProductRightsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_NumberOfQuarterlyInstallmentPayments" name="NumberOfQuarterlyInstallmentPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="eton_ObligationBasedOnAcceptanceOfFdaOfNdaForProductMember" name="ObligationBasedOnAcceptanceOfFdaOfNdaForProductMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_ObligationBasedOnFirstCommercialSaleOfProductMember" name="ObligationBasedOnFirstCommercialSaleOfProductMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_ObligationBasedOnNoGenericCompetitorsLaunchingIn48MonthsMember" name="ObligationBasedOnNoGenericCompetitorsLaunchingIn48MonthsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_OperatingLeaseImprovementAllowance" name="OperatingLeaseImprovementAllowance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="eton_OtherCommitmentAccretedToInterestExpense" name="OtherCommitmentAccretedToInterestExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="eton_OtherCommitmentCurrent" name="OtherCommitmentCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="eton_OtherCommitmentNoncurrent" name="OtherCommitmentNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="eton_PatentCostsPolicyTextBlock" name="PatentCostsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_PaymentsToAcquireInventory" name="PaymentsToAcquireInventory" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="eton_PaymentsToAcquireMarketingRights" name="PaymentsToAcquireMarketingRights" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="eton_PaymentsToAcquireMarketingRightsAcquisitionCosts" name="PaymentsToAcquireMarketingRightsAcquisitionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="eton_PercentageForValuationReserveAgainstDeferredTaxAssets" name="PercentageForValuationReserveAgainstDeferredTaxAssets" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_PierreFabreMember" name="PierreFabreMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_PkuGolikeMember" name="PkuGolikeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_ProceedsFromUpfrontPayment" name="ProceedsFromUpfrontPayment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_ReceiptOfFdaMinutesMember" name="ReceiptOfFdaMinutesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_RevenueAdditionalBasedOnEventAndSalesbasedMilestonesAchievements" name="RevenueAdditionalBasedOnEventAndSalesbasedMilestonesAchievements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="eton_RoyaltiesPercentageOfNetSales" name="RoyaltiesPercentageOfNetSales" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="eton_RunwayGrowthFiinanceCommonStockWarrantsAtAnExercisePriceOf662Member" name="RunwayGrowthFiinanceCommonStockWarrantsAtAnExercisePriceOf662Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_RunwayGrowthFinanceCommonStockWarrantsAtAnExercisePriceOf532Member" name="RunwayGrowthFinanceCommonStockWarrantsAtAnExercisePriceOf532Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_RunwayGrowthFinanceCommonStockWarrantsAtAnExercisePriceOf586Member" name="RunwayGrowthFinanceCommonStockWarrantsAtAnExercisePriceOf586Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_RunwayGrowthFinanceWarrantsMember" name="RunwayGrowthFinanceWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SWKCreditAgreementMember" name="SWKCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SWKHoldingsCorporationMember" name="SWKHoldingsCorporationMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SalesMilestoneFiveMember" name="SalesMilestoneFiveMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SalesMilestoneFourMember" name="SalesMilestoneFourMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SalesMilestoneOneMember" name="SalesMilestoneOneMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SalesMilestoneThreeMember" name="SalesMilestoneThreeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SalesMilestoneTwoMember" name="SalesMilestoneTwoMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SeanEBrynjelsenMember" name="SeanEBrynjelsenMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SelenixAgreementMember" name="SelenixAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_SelenixMember" name="SelenixMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_SharebasedCompensationArrangementBySharebasedPaymentAwardAnnualIncreaseInShareReserveAsAPercentOfOutstandingCommonStock" name="SharebasedCompensationArrangementBySharebasedPaymentAwardAnnualIncreaseInShareReserveAsAPercentOfOutstandingCommonStock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_StockIssuedDuringPeriodSharesStockOptionsExercisedAndVestingOfRestrictedStockAward" name="StockIssuedDuringPeriodSharesStockOptionsExercisedAndVestingOfRestrictedStockAward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_StockIssuedDuringPeriodSharesWarrantExercisesNetOfSharesWithheld" name="StockIssuedDuringPeriodSharesWarrantExercisesNetOfSharesWithheld" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_StockIssuedDuringPeriodValueStockOptionExercisesAndVestingOfRestrictedStockAwards" name="StockIssuedDuringPeriodValueStockOptionExercisesAndVestingOfRestrictedStockAwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="eton_StockIssuedDuringPeriodValueWarrantExercisesNetOfSharesWithheld" name="StockIssuedDuringPeriodValueWarrantExercisesNetOfSharesWithheld" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_The2018EmployeeStockPurchasePlanMember" name="The2018EmployeeStockPurchasePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_The2018PlanMember" name="The2018PlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_TheAmendedAgreementMember" name="TheAmendedAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_TheTwoThousandEighteenEquityIncentivePlanMember" name="TheTwoThousandEighteenEquityIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_TulexPharmaceuticalsIncTulexMember" name="TulexPharmaceuticalsIncTulexMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="eton_UnauditedInterimFinancialInformationPolicyTextBlock" name="UnauditedInterimFinancialInformationPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-11-leases-schedule-of-future-lease-payments-details" name="statement-statement-note-11-leases-schedule-of-future-lease-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-11-leases-schedule-of-leaserelated-assets-and-liabilities-details" name="statement-statement-note-11-leases-schedule-of-leaserelated-assets-and-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-11-leases-schedule-of-leaserelated-assets-and-liabilities-details-parentheticals" name="statement-statement-note-11-leases-schedule-of-leaserelated-assets-and-liabilities-details-parentheticals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-11-leases-tables" name="statement-statement-note-11-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-2-summary-of-significant-accounting-policies-schedule-of-intangible-assets-amortization-expense-details" name="statement-statement-note-2-summary-of-significant-accounting-policies-schedule-of-intangible-assets-amortization-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-2-summary-of-significant-accounting-policies-schedule-of-intangible-assets-details" name="statement-statement-note-2-summary-of-significant-accounting-policies-schedule-of-intangible-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-2-summary-of-significant-accounting-policies-tables" name="statement-statement-note-2-summary-of-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-3-longterm-debt-schedule-of-future-payments-details" name="statement-statement-note-3-longterm-debt-schedule-of-future-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-3-longterm-debt-tables" name="statement-statement-note-3-longterm-debt-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-4-property-and-equipment-schedule-of-property-and-equipment-details" name="statement-statement-note-4-property-and-equipment-schedule-of-property-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-4-property-and-equipment-tables" name="statement-statement-note-4-property-and-equipment-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-5-inventory-schedule-of-inventory-details" name="statement-statement-note-5-inventory-schedule-of-inventory-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-5-inventory-tables" name="statement-statement-note-5-inventory-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-7-sharebased-payment-awards-schedule-of-assumptions-used-to-calculate-fair-value-of-options-granted-details" name="statement-statement-note-7-sharebased-payment-awards-schedule-of-assumptions-used-to-calculate-fair-value-of-options-granted-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-7-sharebased-payment-awards-schedule-of-restricted-stock-unit-activity-details" name="statement-statement-note-7-sharebased-payment-awards-schedule-of-restricted-stock-unit-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-7-sharebased-payment-awards-schedule-of-stock-option-activity-details" name="statement-statement-note-7-sharebased-payment-awards-schedule-of-stock-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-7-sharebased-payment-awards-tables" name="statement-statement-note-7-sharebased-payment-awards-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-8-basic-and-diluted-net-loss-per-common-share-schedule-of-earnings-details" name="statement-statement-note-8-basic-and-diluted-net-loss-per-common-share-schedule-of-earnings-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-8-basic-and-diluted-net-loss-per-common-share-tables" name="statement-statement-note-8-basic-and-diluted-net-loss-per-common-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-9-income-taxes-summary-of-income-tax-expense-and-effective-tax-rate-details" name="statement-statement-note-9-income-taxes-summary-of-income-tax-expense-and-effective-tax-rate-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-note-9-income-taxes-tables" name="statement-statement-note-9-income-taxes-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="eton_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
