Cefaclor EP Impurity G

Chemical Name: (2R,6R,7R)- and (2S,6R,7R)-7-[[(2R)-2-amino-2-phenylacetyl]amino]-3-methylene-8-oxo-5-thia-1-azabicyclo[4.2.0]octane-2-carboxylic acid (as per EP)

Smile: O=C1N(C2C(O)=O)[C@@](SCC2=C)([H])[C@@H]1NC([C@@H](C3=CC=CC=C3)N)=O