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(2007/10/03)(6R,7R)-3-But-3-enoyloxymethyl-8-oxo-7-phenylacetylamino-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(R)-3-But-3-enoyloxymethyl-8-oxo-7-[1-pyridin-2-yl-meth-(Z)-ylidene]-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(6R,7R)-7-Amino-3-but-3-enoyloxymethyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(R)-3-But-3-enoyloxymethyl-7,8-dioxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
3-hydroxymethyl-8-oxo-7-phenylacetylamino-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(R)-5,5,8-Trioxo-7-[1-pyridin-2-yl-meth-(Z)-ylidene]-3-((E)-2-pyridin-2-yl-vinyl)-5λ6-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
(R)-8-Oxo-7-[1-pyridin-2-yl-meth-(Z)-ylidene]-3-((E)-2-pyridin-2-yl-vinyl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester