definiens: means, ( i ) with respect to each Royalty - Bearing Product in each country in the ROW Territory, the period beginning on the date of First Commercial Sale of such Royalty - Bearing Product in such country and ending on the later to occur of ( a)expiration of the last to expire Valid Claim of the [COMPANY] Patent Rights, MERCK Patent Rights or Joint Patent Rights in such country that covers thecomposition of matter or sale or import of the Collaboration Compound contained in such Royalty - Bearing Product or its use for any indication forwhich Commercialization Regulatory Approval has been obtained in such country, ( b ) [ * * * ] from the date of the First Commercial Sale of suchRoyalty - Bearing Product in such country, or ( c ) the last date upon which [COMPANY] supplies any Product to MERCK pursuant to the SupplyAgreement ; and ( ii ) with respect to each Royalty - Bearing Product in the U.S. Territory in the event of a U.S. Commercialization Transfer, theperiod beginning on the date of the U.S. Commercialization Transfer and ending on the latest to occur of ( a ) expiration of the last to expire ValidClaim of the [COMPANY] Patent Rights, MERCK Patent Rights or Joint Patent Rights in the U.S. that covers the composition of matter or sale or importof the Collaboration Compound contained in such Royalty - Bearing Product or its use for any indication for which Commercialization RegulatoryApproval has been obtained in the U.S. Territory, ( b ) [ * * * ] from the date of the First Commercial Sale of such Royalty - Bearing Product in the U.S