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

(2S,3R)-3-[(3R,4S)-4-(tert-Butoxycarbonyl-methyl-amino)-3-hydroxy-5-phenyl-pentanoyloxy]-2-methyl-decanoic acid (S)-1-allyloxycarbonyl-2-methyl-propyl ester

(1R)-1-((1S)-2-{[(1S)-1-carboxy-2-methylpropyl]oxy}-1-methyl-2-oxoethyl)octyl 4-[(tert-butoxycarbonyl)(methyl)amino]-2,4,5-trideoxy-5-phenyl-L-erythro-pentonate