5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-7-(((1-(4-chlorophenyl)cyclopentyl)carbonyl)amino)-8-oxo-, monosodium salt, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-7-((cyanophenylacetyl)amino)-8-oxo-, sodium salt

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)(4-hydroxyphenyl)acetyl)amino)-8-oxo-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)phenylacetyl)amino)-8-oxo-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-methyl-8-oxo- 7-(((1-phenylcyclopentyl)carbonyl)amino)-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-methyl-8-oxo- 7-(((1-phenylcyclopropyl)carbonyl)amino)-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((2-(4-(((1-acetyl-4-hydroxy-2-pyrrolidinyl)carbonyl)amino)phenyl)-1, 4-dihydro-4-oxo-5-pyrimidinyl)carbonyl)amino)phenylacetyl)amino)-3-(((1-(carboxymethyl)-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, disodium salt, (6R-(6-alpha, 7-beta(R*(2S*<4R*))))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)(4-hydroxyphenyl)acetyl)amino)-3-(((1-methyl-1H-1, 3, 4-triazol-5-yl)thio)methyl)-8-oxo-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)(4-hydroxyphenyl)acetyl)amino)-3-(((5-methyl-1, 3, 4-thiadiazol-2-yl)thio)methyl)-8-oxo-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)(4-hydroxyphenyl)acetyl)amino)-8-oxo-3-((1, 3, 4-thiadiazol-2-ylthio)methyl)-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)phenylacetyl)amino)-3-(((1-methyl-1H-1, 3, 4-triazol-5-yl)thio)methyl)-8-oxo-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((4-ethyl-2, 3-dioxo-1-piperazinyl)carbonyl)amino)phenylacetyl)amino)-3-(((5-methyl-1, 3, 4-thiadiazol-2-yl)thio)methyl)-8-oxo-, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((((5-hydroxy-2-(1-piperazinyl)pyrido(2, 3-d)pyrimidin-6-yl)carbonyl)amino)(4-hydroxyphenyl)acetyl)amino)-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, monosodium salt, (6R-(6-alpha, 7-beta(R*)))-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(2-butoxyphenyl)cyclobutyl)carbonyl)amino)-3-methyl-8-oxo-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(2-butoxyphenyl)cyclopropyl)carbonyl)amino)-3-methyl-8-oxo-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(2-ethoxyphenyl)cyclopropyl)carbonyl)amino)-3-methyl-8-oxo-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(2-propoxyphenyl)cyclopentyl)carbonyl)amino)-3-methyl-8-oxo-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(2-propoxyphenyl)cyclopropyl)carbonyl)amino)-3-methyl-8-oxo-, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(3-bromophenyl)cyclopentyl)carbonyl)amino)-3-methyl-8-oxo-, monosodium salt, (6R-trans)-

5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((1-(3-chlorophenyl)cyclopentyl)carbonyl)amino)-3-methyl-8-oxo-, monosodium salt, (6R-trans)-