CAS: 34876-35-2 Molecular Formula: C5 H6 O2 S Molecular Weight (g/mol): 130.165 Synonym: 3-Hydroxy-4-methyl-2(5H)-thiophenone,Cefadroxil Monohydrate Imp. G (EP),Cefalexin Imp. D (EP),Cefradine Imp. F (EP) IUPAC Name: 4-hydroxy-3-methyl-2H-thiophen-5-one SMILES: CC1=C(O)C(=O)SC1