CAS: 88-99-3 Molecular Formula: C8H6O4 Molecular Weight (g/mol): 166.132 MDL Number: MFCD00002467 InChI Key: XNGIFLGASWRNHJ-UHFFFAOYSA-N Synonym: 1,2-benzenedicarboxylic acid,benzene-1,2-dicarboxylic acid,o-phthalic acid,o-dicarboxybenzene,o-benzenedicarboxylic acid,pathalic acid,acide phtalique,kyselina ftalova,ortho-phthalic acid,phthalicacid PubChem CID: 1017 ChEBI: CHEBI:29069 IUPAC Name: phthalic acid SMILES: C1=CC=C(C(=C1)C(=O)O)C(=O)O