Piperacillin EP Impurity M

Chemical Name: (2S,5R,6R)-6-[(2R)-2-[[[2-[ethyl(oxalo)amino]ethyl]carbamoyl]amino]-2-phenylacetamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (as per EP)

Smile: O=C(N[C@]1([H])C(N2[C@@]1(SC(C)(C)[C@@H]2C(O)=O)[H])=O)[C@H](NC(NCCN(C(C(O)=O)=O)CC)=O)C3=CC=CC=C3