Methanesulfonic acid (1R,2S,3R)-1-(benzyloxycarbonylamino-methyl)-2-(4-methoxy-benzyloxy)-3-methoxymethoxy-pent-4-enyl ester

(S)-2-[(1R,2R)-2-Acetoxy-1-(4-methoxy-benzyloxy)-but-3-enyl]-aziridine-1-carboxylic acid benzyl ester