cis-3-<2-(2-chloroacetamidothiazol-4-yl)-(Z)-2-(n-butoxyimino)acetamido>-4-methoxycarbonyl-2-azetidinone

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

cis-3-<2-(2-chloroacetamidothiazol-4-yl)-(Z)-2-ethoxyiminoacetamido>-4-methoxycarbonyl-2-azetidinone