H-Ala-Glu(OBn)-Phe-OBn

(4S,5S)-5-((1R,2R)-2-{(S)-1-[(S)-3-Benzyloxycarbonyl-1-((S)-1-benzyloxycarbonyl-2-phenyl-ethylcarbamoyl)-propylcarbamoyl]-ethylcarbamoyl}-cyclopentyl)-4-isobutyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester