Cefazolin EP Impurity A Potassium salt

Chemical Name: (6R,7R)-7-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 Potassium salt (as per EP); (6R,7R)-7-Amino-3-[(5-methyl-1,3,4-thiadiazol-2-ylthio)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Potassium salt (as per USP)

Smile: O=C(C(N12)=C(CSC3=NN=C(C)S3)CS[C@]2([H])[C@H](N)C1=O)O.[K]