Cefazolin EP Impurity B ;
(6R,7R)-7-[(2,2-Dimethylpropanoyl)amino]-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid ;
CAS # 2384108-14-7 (acid) ; 1798390-48-3 (acid) ; 1798004-60-0 (sodium salt) ;
C16H20N4O4S3 (Acid) ; Mol. Wt.: 428.55 ;
C16H19N4NaO4S3 (Sodium Salt) ; MW: 450.53 ;