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<!--Created on: 8/8/2018 11:14:52 AM-->
<!--Modified on: 8/8/2018 11:14:52 AM-->
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  <element id="btai_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodIntrinsicValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedWeightedAverageRemainingContractualTerm" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedWeightedAverageRemainingContractualTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_InitialPublicOfferingAbstract" name="InitialPublicOfferingAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_InitialPublicOfferingTextBlock" name="InitialPublicOfferingTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_UnauditedInterimConsolidatedFinancialInformationPolicyTextBlock" name="UnauditedInterimConsolidatedFinancialInformationPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_DeferredOfferingCostsPolicyTextBlock" name="DeferredOfferingCostsPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_NumberOfEmergingProgram" name="NumberOfEmergingProgram" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_ProceedsFromIssuanceOfCommonStockGross" name="ProceedsFromIssuanceOfCommonStockGross" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_LumpSumPayableUponMilestonesMember" name="LumpSumPayableUponMilestonesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_PayableUponLaterTwelveMonthAnniversaryOfOfferingAndSpecifiedMilestoneMember" name="PayableUponLaterTwelveMonthAnniversaryOfOfferingAndSpecifiedMilestoneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_LumpSumPaymentAfterClosingIpoMember" name="LumpSumPaymentAfterClosingIpoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_LumpSumPaymentWithinSixtyDaysAfterCumulativeNetSalesMember" name="LumpSumPaymentWithinSixtyDaysAfterCumulativeNetSalesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_MaximumThresholdPeriodForPayment" name="MaximumThresholdPeriodForPayment" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageGrantDateFairValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReclassificationOfOptionsFromNonEmployeeToEmployee" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReclassificationOfOptionsFromNonEmployeeToEmployee" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_Sharebasedcompensationarrangementsbysharebasedpaymentawardoptionsreclassificationofoptionsfromnonemployeetoemployeeinperiodweightedaverageexerciseprice" name="Sharebasedcompensationarrangementsbysharebasedpaymentawardoptionsreclassificationofoptionsfromnonemployeetoemployeeinperiodweightedaverageexerciseprice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsreclassificationofoptionsfromnonemployeetoemployeeinperiodintrinsicvalue" name="Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsreclassificationofoptionsfromnonemployeetoemployeeinperiodintrinsicvalue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsreclassificationofoptionsfromnonemployeetoemployeeweightedaverageremainingcontractualterm" name="Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsreclassificationofoptionsfromnonemployeetoemployeeweightedaverageremainingcontractualterm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_SwingSpaceAgreementMember" name="SwingSpaceAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_FifthFloorLeaseMember" name="FifthFloorLeaseMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_TwelfthFloorLeaseMember" name="TwelfthFloorLeaseMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_ThroughTerminationDateMember" name="ThroughTerminationDateMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_BeyondTerminationDateMember" name="BeyondTerminationDateMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_BaseLeaseRentalsExpense" name="BaseLeaseRentalsExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_ElectricityExpense" name="ElectricityExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_TermForExecutionOfSubsequentLeases" name="TermForExecutionOfSubsequentLeases" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_BeyondExpirationDateMember" name="BeyondExpirationDateMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_TermOfAgreement" name="TermOfAgreement" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_DevelopmentMilestonesMember" name="DevelopmentMilestonesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_SalesMilestonesMember" name="SalesMilestonesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_CollaborativeArrangementMilestonePaymentsPotential" name="CollaborativeArrangementMilestonePaymentsPotential" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_CollaborativeArrangementMilestonePotentialPercen" name="CollaborativeArrangementMilestonePotentialPercen" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="btai_BioxcelCorporationMember" name="BioxcelCorporationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
