(6R,7R)-7-{2-[4-((E)-2-Carboxy-vinyl)-2,5-dichloro-phenylsulfanyl]-acetylamino}-3-chloromethyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid

(6R,7R)-7-[2-(4-tert-Butoxycarbonyl-2,5-dichloro-phenylsulfanyl)-acetylamino]-3-chloromethyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

(6R,7R)-7-{2-[4-((E)-2-tert-Butoxycarbonyl-vinyl)-2,5-dichloro-phenylsulfanyl]-acetylamino}-3-chloromethyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

diphenylmethyl (6R,7R)-7-[2-({4-[(1E)-2-{[2-(tert-butoxy)-2-oxoethyl]carbamoyl}eth-1-en-1-yl]-2,5-dichlorophenyl}sulfanyl)acetamido]-3-(chloromethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate