(S)-4-[(E)-(1R,2R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-hydroxy-pent-3-enyl]-2,2-dimethyl-oxazolidine-3-carboxylic 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