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(2007/10/02)diphenylmethyl 7α-benzoylamino-3-methylene-1-oxacepham-4α-carboxylate
diphenylmethyl 7α-benzoylamino-3β-phenylseleno-3α-chloromethyl-1-oxacepham-4α-carboxylate
methyl 7α-benzoylamino-3α-chloromethyl-3β-methylthio-1-oxacepham-4α-carboxylate
methyl 7α-benzoylamino-3α-(1-methyl-1H-tetrazol-5-yl)thiomethyl-3β-methylthio-1-oxacepham-4α-carboxylate
7α-benzoylamino-3α-(1-methyl-1H-tetrazol-5-yl)thiomethyl-3β-methylthio-1-oxacephem-4α-carboxylic acid
7α-benzoylamino-3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-1-oxa-3-cephem-4-carboxylic acid
methyl 7α-benzoylamino-3β-phenylthio-3α-chloromethyl-1-oxacepham-4α-carboxylate