definiens: means any research, development or commercialization activity of a Third Partythat involves a compound or product ( other than a Secondary Pharmacology Compound ) for which its prophylactic ortherapeutic activity is known to be derived in any material respect through any Exclusivity Mechanism for use in theField or, prior to the Schizophrenia Expiration Date, Schizophrenia that would ( a ) were such Third Party to undergo aChange of Control transaction with [COMPANY], cause [COMPANY] to be in breach of any of its exclusivity obligationsunder Section 8.6.1, or ( b ) were such Third Party to undergo a Change of Control transaction with [COMPANY], causeAstraZeneca to be in breach of any of its exclusivity obligations under Section 8.6.3 or terminate or limit any ofTargacept ’s exclusivity obligations under Section 8.6.1