3-Methyl-butyric acid (2R,3S,6S,7R,8R)-3-tert-butoxycarbonylamino-8-butyl-2,6-dimethyl-4,9-dioxo-[1,5]dioxonan-7-yl ester

(R)-2-[(1R,2S)-2-((2S,3R)-2-tert-Butoxycarbonylamino-3-hydroxy-butyryloxy)-1-(3-methyl-butyryloxy)-propyl]-hexanoic acid

1-((R)-4-Phenyl-2-thioxo-oxazolidin-3-yl)-hexan-1-one

(R)-2-[(1R,2S)-2-Hydroxy-1-(3-methyl-butyryloxy)-propyl]-hexanoic acid benzyl ester

(R)-2-[(1R,2S)-1-(3-Methyl-butyryloxy)-2-triethylsilanyloxy-propyl]-hexanoic acid benzyl ester

(R)-2-((1R,2S)-1-Hydroxy-2-triethylsilanyloxy-propyl)-1-((R)-4-phenyl-2-thioxo-oxazolidin-3-yl)-hexan-1-one

3-Methyl-butyric acid (1R,2R)-2-((R)-4-phenyl-2-thioxo-oxazolidine-3-carbonyl)-1-((S)-1-triethylsilanyloxy-ethyl)-hexyl ester

(R)-2-[(1R,2S)-2-((2S,3R)-3-Benzyloxy-2-tert-butoxycarbonylamino-butyryloxy)-1-(3-methyl-butyryloxy)-propyl]-hexanoic acid benzyl ester