(S)-2-{(R)-2-[(S)-2-Amino-3-(tert-butyl-dimethyl-silanyloxy)-propionylamino]-3-phenyl-propionylamino}-3-(tert-butyl-dimethyl-silanyloxy)-propionic acid methyl ester

(S)-2-{(R)-2-[(S)-2-((S)-2-Benzyloxycarbonylamino-3-methyl-butyrylamino)-3-(tert-butyl-dimethyl-silanyloxy)-propionylamino]-3-phenyl-propionylamino}-3-(tert-butyl-dimethyl-silanyloxy)-propionic acid methyl ester