CAS: 121-91-5 Molecular Formula: C8 H6 O4 Molecular Weight (g/mol): 166.13 Synonym: Isophthalic Acid,1,3-Benzenedicarboxylic acid (9CI, ACI),Isophthalic acid (8CI),3-Carboxybenzoic acid,HA 20,HA 20 (acid),Isoterephthalic acid,m-Benzenedicarboxylic acid,m-Carboxybenzoic acid,m-Dicarboxybenzene,m-Phthalic acid,m-Phthalic acid,NSC 15310 IUPAC Name: benzene-1,3-dicarboxylic acid SMILES: OC(=O)c1cccc(c1)C(=O)O