(6R,7R)-7-[[(2R)-2-(4-hydroxyphenyl)-2-[(6-methyl-4-oxo1H-pyridine-3-carbonyl)amino]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-hydroxyphenyl)-2-[(6-methyl-4-oxo-1H-pyridine-3-carbonyl)amino]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-hydroxyphenyl)-2-[[(6-methyl-4-oxo-1H-pyridin-3-yl)-oxomethyl]amino]-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-hydroxyphenyl)-2-[(4-keto-6-methyl-1H-pyridine-3-carbonyl)amino]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-hydroxyphenyl)-2-[(6-methyl-4-oxo-1H-pyridin-3-yl)carbonylamino]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 Cefpiramide (USP) D03428