CAS: 121-34-6 Molecular Formula: C8H8O4 Molecular Weight (g/mol): 168.15 MDL Number: MFCD00002551 InChI Key: WKOLLVMJNQIZCI-UHFFFAOYSA-N Synonym: vanillic acid,acide vanillique,p-vanillic acid,benzoic acid, 4-hydroxy-3-methoxy,3-methoxy-4-hydroxybenzoic acid,vanillate,m-anisic acid, 4-hydroxy,protocatechuic acid, 3-methyl ester,4-hydroxy-3-methoxy-benzoic acid,unii-gm8q3jm2y8 PubChem CID: 8468 ChEBI: CHEBI:30816 IUPAC Name: 4-hydroxy-3-methoxybenzoic acid SMILES: COC1=CC(=CC=C1O)C(O)=O