((S)-2-(((3S,4R)-4-((2S,3R)-2-((tert-butoxycarbonyl)amino)-3-(((S)-3-(4-methoxyphenyl)-2-(methylamino)propanoyl)oxy)butanamido)-3-hydroxy-5-methylhexanoyl)oxy)-3-methylbutanoyl)-L-leucyl-L-alanine

(3S,4R)-4-(tert-butoxycarbonylamino)-3-hydroxy-5-methylhexanoic acid methyl ester

N-((tert-butoxycarbonyl)-L-leucyl)-L-alanine benzyl ester

(3S,4R)-4-(tert-butoxycarbonylamino)-5-methyl-3-(tert-butyldimethylsilanyloxy)hexanoic acid

(3S,4R)-4-(tert-butoxycarbonylamino)-5-methyl-3-(tert-butyldimethylsilanyloxy)hexanoic acid methyl ester