SMILES: CC1([C@@H](N2[C@H](S1)[C@@H](C2=O)NC(=O)[C@@H](C3=CCC=CC3)N)C(=O)O)C
Description: The molecule is a penicillin in which the substituent at position 6 of the penam ring is a (2R)-2-amino-2-(cyclohexa-1,4-dien-1-yl)acetamido group. It is a penicillin and a penicillin allergen. It derives from an ampicillin.