definiens: shall mean any compound that demonstrates activity against a particular molecular target, which compound is derived from a Library Compound active against that molecular target by [COMPANY], or Teijin or its Affiliates, or by a third party under authority from Teijin . A compound shall be deemed to have been " derived from ' a Library Compound if it : ( i)(A ) results from a chemical synthesis program based on a Library Compound or B is based on e - activity data relating to a Library Compound ( with or without MCP - I Activi or Chemokine Receptor Activity ), and ( ii ) is a compound synt size unng the MCP- c usivity Period ( with respect to a Library Compound with Mcp·I Activi e emokin Exclusivity Period ( with respect to a Library Compound with Chemokin Receptor Activity ) . It is understood that shall include compounds derived from a Library Compound or from another Derivative Compound