(6R,7R)-7-[[(2R)-2-[(4-ethyl-2,3-dioxopiperazine-1-carbonyl)amino]-2-(4-hydroxyphenyl)acetyl]amino]-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (6R,7R)-7-[[(2R)-2-[(4-ethyl-2,3-dioxo-piperazine-1-carbonyl)amino]-2-(4-hydroxyphenyl)acetyl]amino]-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (6R,7R)-7-[[(2R)-2-[[(4-ethyl-2,3-dioxo-1-piperazinyl)-oxomethyl]amino]-2-(4-hydroxyphenyl)-1-oxoethyl]amino]-3-[[(1-methyl-5-tetrazolyl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (6R,7R)-7-[[(2R)-2-[(4-ethyl-2,3-diketo-piperazine-1-carbonyl)amino]-2-(4-hydroxyphenyl)acetyl]amino]-8-keto-3-[[(1-methyltetrazol-5-yl)thio]methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (6R,7R)-7-[[(2R)-2-[(4-ethyl-2,3-dioxo-piperazin-1-yl)carbonylamino]-2-(4-hydroxyphenyl)ethanoyl]amino]-3-[(1-methyl-1,2,3,4-tetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Prestwick2_000327 SPBio_002254 BPBio1_000367 Prestwick3_000327 Prestwick0_000327 BSPBio_000333 C06883 Cefoperazone (6R,7R)-7-{[(2R)-2-{[(4-ethyl-2,3-dioxopiperazin-1-yl)carbonyl]amino}-2-(4-hydroxyphenyl)acetyl]amino}-3-{[(1-methyl-1H-tetrazol-5-yl)thio]methyl}-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Prestwick1_000327