Cefaclor EP Impurity D

Chemical Name: (2R,6R,7R)- and (2S,6R,7R)-7-[[(2R)-2-amino-2-phenylacetyl]amino]-3-chloro-8-oxo-5-thia- 1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid (as per EP); ((6R,7R)-7-{[(2R)-(Aminophenylacetyl)]amino}-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid) (as per USP)