Ampicillin EP Impurity E

Chemical Name: (2R)-2-[[[(2S,5R,6R)-6-[[(2R)-2-amino-2-phenylacetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-yl]carbonyl]amino]-2-phenylacetic acid (as per EP); (R)-2-((2S,5R,6R)-6-((R)-2-Amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxamido)-2-phenylacetic acid (as per USP)

Smile: N[C@@H](C(N[C@@]1([H])[C@@]([H])(SC(C)(C)[C@]2([H])C(N[C@H](C3=CC=CC=C3)C(O)=O)=O)N2C1=O)=O)C4=CC=CC=C4