(3R,4S,5S)-4-[((S)-2-Benzyloxycarbonylamino-3-phenyl-propionyl)-methyl-amino]-3-methoxy-5-methyl-heptanoic acid tert-butyl ester

(3R,4S,5S)-4-{[(S)-2-((S)-2-Dimethylamino-3-methyl-butyrylamino)-3-phenyl-propionyl]-methyl-amino}-3-methoxy-5-methyl-heptanoic acid tert-butyl ester