(R)-2-[(S)-2-((S)-2-tert-Butoxycarbonylamino-3-methyl-butyrylamino)-4-methyl-pentanoylamino]-3-phenyl-propionic acid methyl ester

2-[2-(2-{2-[(2-amino-4-methyl-pentanoyl)-methyl-amino]-4-methyl-pentanoylamino}-3-methyl-butyrylamino)-4-methyl-pentanoylamino]-3-phenyl-propionic acid

2-[2-(2-{2-[(2-tert-butoxycarbonylamino-4-methyl-pentanoyl)-methyl-amino]-4-methyl-pentanoylamino}-3-methyl-butyrylamino)-4-methyl-pentanoylamino]-3-phenyl-propionic acid methyl ester