(2S,3R)-3-[(3R,4S)-4-(tert-Butoxycarbonyl-methyl-amino)-3-(tert-butyl-dimethyl-silanyloxy)-5-phenyl-pentanoyloxy]-2-methyl-decanoic acid (S)-1-benzyloxycarbonyl-2-methyl-propyl ester

tert-butyl (2S,3R)-2-benzyl-3--5-oxo-1-pyrrolidinecarboxylate

(3R,4S)-4-(tert-Butoxycarbonyl-methyl-amino)-3-(tert-butyl-dimethyl-silanyloxy)-5-phenyl-pentanoic acid

(2S,3R)-3-[(3R,4S)-4-(tert-Butoxycarbonyl-methyl-amino)-3-(tert-butyl-dimethyl-silanyloxy)-5-phenyl-pentanoyloxy]-2-methyl-decanoic acid benzyl ester