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  <xs:element id="vtvt_IndefiniteMember" abstract="true" name="IndefiniteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vtvt_IncomeTaxesLineItems" abstract="true" name="IncomeTaxesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="vtvt_MaximumPercentageOfTaxableIncomeLimitedToOffsetByNetOperatingLossCarryforwards" abstract="false" name="MaximumPercentageOfTaxableIncomeLimitedToOffsetByNetOperatingLossCarryforwards" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vtvt_IncomeTaxReconciliationPartnershipIncomeFederalNotSubjectToTax" abstract="false" name="IncomeTaxReconciliationPartnershipIncomeFederalNotSubjectToTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vtvt_IncomeTaxReconciliationForeignWithholdingTax" abstract="false" name="IncomeTaxReconciliationForeignWithholdingTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vtvt_ScheduleOfEarningsPerShareTable" abstract="true" name="ScheduleOfEarningsPerShareTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="vtvt_ScheduleOfEarningsPerShareLineItems" abstract="true" name="ScheduleOfEarningsPerShareLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
