definiens: as hereinafter defined ) which is intended for use as an enhancer for magnetic resonance imaging, which compound is covered by said MGH patents and patent applications as well as by EPIX patent applications ; WHEREAS, EPIX and MKG wish to modify their existing relationship and the existing collaboration agreement ( as h eretofore amended ) between them ( i ) to permit EPIX to enter into that certain Strategic Collaboration Agreement of even date herewith ( the ) by and between EPIX and Schering Aktiengesellschaft, a German corporation having its princ ipal place of business at 13342, Berlin, Germany ( ) ; and ( ii ) to permit MKG to enter into that certain Manufacturing and Supply Agreement of even date herewith by and between MKG and Schering ( the ) ; and WHEREAS, MK G has provided to EPIX all necessary written consents so as to permit EPIX to enter into the Collaboration Agreement and the Manufacturing Agreement, and EPIX and MKG therefore desire to enter into this Amended and Restated Strategic Collaboration Agreemen t