2-(4-methylphenyl)sulfonyloxyacetic acid
3-deacetyloxy-7-aminocephalosporanic acid
(Toluene-4-sulfonyloxy)-acetic acid quinolin-8-yl ester
2-chloro-2-oxoethyl 4-methylbenzenesulfonate
(6R,7R)-7-{2-[1-(4-Chloro-phenyl)-1H-tetrazol-5-ylsulfanyl]-acetylamino}-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-3-Methyl-8-oxo-7-[2-(1-p-tolyl-1H-tetrazol-5-ylsulfanyl)-acetylamino]-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-7-{2-[1-(3-Methoxy-phenyl)-1H-tetrazol-5-ylsulfanyl]-acetylamino}-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid