(2R,3R,4S)-2-benzyl-3-hydroxy-4-benzyloxypentanoic acid

(2R,3R,4S)-2-benzyl-3-(tert-butyldimethylsilanyloxy)-4-benzyloxypentanoic acid

(2R,3R,4S)-2-Benzyl-4-benzyloxy-3-(tert-butyl-dimethyl-silanyloxy)-pentanoic acid (S)-2-benzyloxycarbonyl-2-tert-butoxycarbonylamino-ethyl ester

[(1S,2S,3S)-3-Benzyl-2-hydroxy-1-isobutyl-4-((R)-4-isopropyl-2-oxo-oxazolidin-3-yl)-4-oxo-butyl]-carbamic acid tert-butyl ester