Cefazolin EP Impurity I

Chemical Name: 2-[carboxy[(1H-tetrazol-1-ylacetyl)amino]methyl]-5-[[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]methyl]-5,6-dihydro-2H-1,3-thiazine-4-carboxylic acid (as per EP); 2-((2-(1H-tetrazol-1-yl)acetamido)(carboxy)methyl)-5-(((5-methyl-1,3,4-thiadiazol-2-yl)thio)methyl)-5,6-dihydro-2H-1,3-thiazine-4-carboxylic acid (as per USP)