3-methyl-2-[3-oxo-4-(2-phenoxy-acetylamino)-3H-isothiazol-2-yl]-but-3-enoic acid methyl ester

methyl 4-oxo-5-(2-phenoxyacetamido)-2-(prop-1-en-2-yl)-3,4-dihydro-2H-1,3-thiazine-2-carboxylate

(3S,4S)-3-benzyloxycarbonylamino-4-acetoxy-azetidin-2-one

bis<(3S,4R)-3-benzyloxycarbonylamino-3-methoxy-1-(1-methoxycarbonyl-2-methylprop-1-enyl)-2-oxoazetidin-4-yl> disulfide

((2S,3S)-2-Acetoxy-3-benzyloxycarbonylamino-4-oxo-azetidin-1-yl)-oxo-acetic acid methyl ester