methyl N-(N-((tert-butoxycarbonyl)-D-isoleucyl)-N-methyl-L-alanyl)-N-methyl-L-leucyl-L-leucinate

methyl N-(N-(((2R,3R)-2-((R)-4-azido-2-((S)-2-((tert-butoxycarbonyl)(methyl)amino)-N-methylpropanamido)butanamido)-3-hydroxy-4-methylpentanoyl)-D-alloisoleucyl)-N-methyl-L-alanyl)-N-methyl-L-leucyl-L-leucinate

(R)-4-azido-2-((tert-butoxycarbonyl)(methyl)amino)butanoic acid

ethyl (2R,3R)-2-((R)-4-azido-2-((tert-butoxycarbonyl)(methyl)amino)butanamido)-3-hydroxy-4-methylpentanoate