2(R)-<5(R)-<1(S)-<(tert-butyloxycarbonyl)amino>-3-methylbutyl>-2,2-dimethyl-4(R)-dioxolanyl>-3-methylbutanoic acid

2(R)-<5(R)-<1(S)-<(tert-butyloxycarbonyl)amino>-3-methylbutyl>-2,2-dimethyl-4(R)-dioxolanyl>-3-methylbutanoic acid 2(S)-methylbutylamide

(2R,4R,5S)-2-(2-propyl)-4-hydroxy-5-<(tert-butyloxycarbonyl)amino>-7-methyloctanoic acid δ-lactone

(2R,3R,4R,5S)-5-Amino-3,4-dihydroxy-2-isopropyl-7-methyl-octanoic acid ((S)-2-methyl-butyl)-amide