definiens: shall mean, except as otherwise provided herein, achemical entity that meets the Compound Criteria for a Mitotic Kinesin Target, which chemical entity ( i ) is discovered, synthesized or identified by CK or GSKusing CK Existing Technology, [COMPANY] Existing Technology, Collaboration Technology, and/or Post - Collaboration Technology prior to, during, or, in the case of GSK(subject to ( a ) below ), after the Exclusivity Period or any Extension Period, and which, ( ii ) at [COMPANY] 's discretion, may be subject to development as aDevelopment Compound under Section 2.5 of this Agreement . Notwithstanding theforegoing : ( a ) A chemical entity that is first identified by [COMPANY] after the endof the Exclusivity Period, or after any Extension Period under Section 4.2.2below ( whichever is later ), shall not be deemed a Compound unless such chemicalentity was discovered, synthesized or identified using CK Existing Technology, Collaboration Technology or Post - Collaboration Technology