(1R)?-?1-?[[[(1,?1-?Dimethylethyl)?diphenylsilyl]?oxy]?methyl]?-?1,?2-?ethanediyl Ester 9-?Octadecenoic Acid (9Z)? is an intermediate in the synthesis of 1,2-Dioleoyl-rac-glycerol (D482175), which is an analog of 1,3-Dioleoylglycerol (D484210) which is used in the synthesis of amphiphilic gadolinium complexes as MRI contrast agents.