definiens: means : ( a ) any compound identified in the HCM1 Program ( including in activitiespreceding such Program carried out by [COMPANY] prior to the Effective Date ) that meets the HCM1 Criteria ; ( b ) anycompound that ( i ) is a derivative or modification of any compound described in subsection ( a ), ( ii ) is developed fromsuch compound in subsection ( a ) by or on behalf a Party or its Affiliate or ( Sub)licensee ( where such developmentfrom such compounds is documented by laboratory notebooks or other competent proof, including Committeeminutes ) and ( iii ) meets the HCM1 Criteria ; and ( c ) any salt, hydrate, solvate, free acid form or free base form, crystalline polymorph, amorphous form, racemic or optically - active mixture, or zwitterion form of any compounddescribed in subsection ( a ) or ( b ) that meets the HCM1 Criteria . The Parties hereby agree that : ( i ) that certaincompound known as MYK-461 and described in Exhibit K is an HCM1 Compound ; and ( ii ) the Potential Backup HCM1Compounds are potential HCM1 Compounds, each of which shall be deemed an HCM1 Compound if and when furthertesting after the Effective Date confirms that such Potential Backup HCM1 Compound meets the HCM1 Criteria