sodium cis-3-<2-(2-aminothiazol-4-yl)-(Z)-2-ethoxyiminoacetamido>-4-methoxycarbonyl-2-azetidinone-1-sulfonate

sodium cis-3-<2-(2-aminothiazol-4-yl)-(Z)-2-(i-propoxyimino)acetamido>-4-methoxycarbonyl-2-azetidinone-1-sulfonate

sodium cis-3-<2-(2-aminothiazol-4-yl)-(Z)-2-(n-propoxyimino)acetamido>-4-methoxycarbonyl-2-azetidinone-1-sulfonate

Sodium; (2S,3S)-3-[2-[(Z)-allyloxyimino]-2-(2-amino-thiazol-4-yl)-acetylamino]-2-methoxycarbonyl-4-oxo-azetidine-1-sulfonate

(2S,3S)-3-{2-[2-(2-Chloro-acetylamino)-thiazol-4-yl]-2-[(Z)-methoxycarbonylmethoxyimino]-acetylamino}-4-oxo-azetidine-2-carboxylic acid methyl ester