(6R,7R)-7-{2-(2-Amino-thiazol-4-yl)-2-[(Z)-1-carboxy-1-methyl-ethoxyimino]-acetylamino}-3-{[(3-cyano-4,5-dihydroxy-benzoyl)-ethyl-amino]-methyl}-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-7-{2-(2-Amino-thiazol-4-yl)-2-[(Z)-1-carboxy-1-methyl-ethoxyimino]-acetylamino}-3-[(3-bromo-4,5-dihydroxy-benzenesulfonylamino)-methyl]-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-7-{2-(2-Amino-thiazol-4-yl)-2-[(Z)-1-carboxy-1-methyl-ethoxyimino]-acetylamino}-3-{[(3-chloro-4,5-dihydroxy-benzoyl)-ethyl-amino]-methyl}-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-7-{2-(2-Amino-thiazol-4-yl)-2-[(Z)-1-carboxy-1-methyl-ethoxyimino]-acetylamino}-3-[(2,5-dichloro-3,4-dihydroxy-benzoylamino)-methyl]-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-7-{2-(2-Amino-thiazol-4-yl)-2-[(Z)-1-carboxy-1-methyl-ethoxyimino]-acetylamino}-3-[(3,4-dihydroxy-benzoylamino)-methyl]-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid