(2S,9R)-9-(tert-butyldiphenylsiloxy)-8-oxo-2-(tert-butoxycarbonyl)-amino-4-decenoic acid benzyl ester

(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