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    <element id="BPTH_NotesPayableCurrentEstimated" name="NotesPayableCurrentEstimated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_PeriodicPaymentOnNoteAugust2025" name="PeriodicPaymentOnNoteAugust2025" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_PeriodicPaymentOnNoteStartingSeptember2025" name="PeriodicPaymentOnNoteStartingSeptember2025" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_PeriodicPaymentOnNoteSeptember2025" name="PeriodicPaymentOnNoteSeptember2025" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_PeriodicPaymentOnNoteStartingOctober2025" name="PeriodicPaymentOnNoteStartingOctober2025" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_PeriodicPaymentOnNoteStartingJuly2026" name="PeriodicPaymentOnNoteStartingJuly2026" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_PeriodicPaymentOnNoteStartingAugust2026" name="PeriodicPaymentOnNoteStartingAugust2026" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_ShortTermDebtEventOfDefaultPercentageOfOutstandingPrincipalImmediatelyDue" name="ShortTermDebtEventOfDefaultPercentageOfOutstandingPrincipalImmediatelyDue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_ShortTermDebtEventOfDefaultInterestPercentage" name="ShortTermDebtEventOfDefaultInterestPercentage" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_ShortTermDebtDefaultPenalty" name="ShortTermDebtDefaultPenalty" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_AccruedLiabilitiesCurrentEstimated" name="AccruedLiabilitiesCurrentEstimated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_AccruedClinicalTrialExpenses" name="AccruedClinicalTrialExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_AccruedEmployeeSalaryAndBenefitExpenses" name="AccruedEmployeeSalaryAndBenefitExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantsAndRightsOutstandingEstimated" name="WarrantsAndRightsOutstandingEstimated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_FairValueAdjustmentOfWarrantsEstimated" name="FairValueAdjustmentOfWarrantsEstimated" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantAndDerivativeLiability" name="WarrantAndDerivativeLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantMeasurementInputRiskFreeInterestRate" name="WarrantMeasurementInputRiskFreeInterestRate" nillable="true" xbrli:periodType="instant" type="xbrli:pureItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantMeasurementInputExpectedVolatility" name="WarrantMeasurementInputExpectedVolatility" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantMeasurementInputExpectedTermMinimum" name="WarrantMeasurementInputExpectedTermMinimum" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantMeasurementInputExpectedTermMaximum" name="WarrantMeasurementInputExpectedTermMaximum" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_WarrantMeasurementDividendYield" name="WarrantMeasurementDividendYield" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_StockholdersEquityEstimated" name="StockholdersEquityEstimated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="BPTH_OtherCommitmentsDrugTestingServices" name="OtherCommitmentsDrugTestingServices" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
</schema>
