(2R,4S)-1-{(S)-2-[(S)-2-(9H-Fluoren-9-ylmethoxycarbonylamino)-2-methyl-butyrylamino]-3-phenyl-propionyl}-4-methyl-pyrrolidine-2-carboxylic acid benzyl ester

(2R,4S)-1-((S)-2-{(S)-2-[(2S,9R)-2-tert-Butoxycarbonylamino-9-(tert-butyl-diphenyl-silanyloxy)-8-oxo-decanoylamino]-2-methyl-butyrylamino}-3-phenyl-propionyl)-4-methyl-pyrrolidine-2-carboxylic acid benzyl ester