(S)-2-[(S)-3-(4-Benzyloxy-phenyl)-2-butyrylamino-propionylamino]-4-methyl-pentanoic acid [(S)-1-benzyloxymethyl-2-(4-benzyloxy-phenyl)-ethyl]-amide

[(S)-1-{(S)-1-[(S)-1-Benzyloxymethyl-2-(4-benzyloxy-phenyl)-ethylcarbamoyl]-3-methyl-butylcarbamoyl}-2-(4-benzyloxy-phenyl)-ethyl]-carbamic acid tert-butyl ester