[(E)-(1S,2R,3R)-3-(tert-Butyl-dimethyl-silanyloxy)-2-hydroxy-1-hydroxymethyl-hex-4-enyl]-carbamic acid benzyl ester

(S)-2-((E)-(1R,2R)-2-Acetoxy-4-methoxycarbonyl-4-methoxycarbonylamino-1-phenylacetoxy-but-3-enyl)-aziridine-1-carboxylic acid benzyl ester

(S)-2-((E)-(1R,2S)-2-Acetoxy-4-acetylamino-3-bromo-1-hydroxy-4-methoxycarbonyl-but-3-enyl)-aziridine-1-carboxylic acid benzyl ester