SMILES: CC1([C@@H](N2[C@H](S1)[C@@H](C2=O)NC=O)C(=O)O)C
Description: The molecule is a penicillanic acid having a (6R)-formamido substituent. It derives from a 6-aminopenicillanic acid. It is a conjugate acid of a 6-formamidopenicillanate.