definiens: means, ( i ) when used in relation to a particular country and a particular Licensed Product, a period starting on t he Effective Date and expiring upon the later of ( a ) ( 1 ) with respect to products Commercialized by Mersana or an y of its Affiliates or sublicensees, the expiry of the last - to - expire Recepta Patent which has at least one Valid Claim Covering such Licensed Product in such countr y ( including the term of any applicable SPC ) or ( 2 ) w ith respect to products Commercialized by Recepta o r any of its Affiliates or sublicensees, the expiry of the l ast - to - expire Mersana Patent which has at least one Valid Claim Covering such Licensed Product in the Recepta Terri tory ( including the term of any applicable SPC ) and ( b ) ten ( 10 ) years from the date of First Commercial Sale o f such Licensed Product in such country, ( ii ) when used in relation to a particular country, the last to expir e Royalty Term, within the meaning of the foregoing clause ( i ), in such country and ( iii ) when used other than in rela tion to a 11 [ * * * ] Portions of this exhibit have been redacted p ursuant to a confidential treatment request . An unredacted version of this exhibit has been filed s eparately with the Commission