Chemical Name: (S)-2-((3S,5aS,8aS,9aS)-3-methyl-1,4-dioxodecahydro-2H-cyclopenta[4,5]pyrrolo[1,2-a]pyrazin-2-yl)-4-phenylbutanoic acid
Synonym: Ampicillin USP related compound A ; 6-Aminopenicillanic Acid
Smile: O=C(O)[C@@H](N([C@H]1C)C([C@@](C[C@@]2([H])[C@]3([H])CCC2)([H])N3C1=O)=O)CCC4=CC=CC=C4