(S)-2-[((2S,4R)-2-{(S)-2-[((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoyl)-methyl-amino]-3-phenyl-propionylamino}-4-methyl-octanoyl)-methyl-amino]-propionic acid methyl ester

methyl N-((2S,4R)-2-((S)-5-(((benzyloxy)carbonyl)(methoxy)amino)-2-((S)-2-((tert-butoxycarbonyl)amino)-N,4-dimethylpentanamido)pentanamido)-4-methyloctanoyl)-N-methyl-L-alaninate

(S)-2-{[(2S,4R)-2-((R)-2-tert-Butoxycarbonylamino-4-cyano-butyrylamino)-4-methyl-octanoyl]-methyl-amino}-4-methyl-pentanoic acid

(S)-2-{[(2S,4R)-2-((R)-2-tert-Butoxycarbonylamino-4-cyano-butyrylamino)-4-methyl-octanoyl]-methyl-amino}-4-methyl-pentanoic acid tert-butyl ester