Methanesulfonic acid (E)-(2S,3R,4R)-2-benzyloxycarbonylamino-4-(tert-butyl-dimethyl-silanyloxy)-3-hydroxy-hept-5-enyl 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