Synonyms: Benzoic acid, 4-hydroxy-3-methoxy-, Vanillic acid (8CI), 4-Hydroxy-3-methoxybenzoic acid, 2-Methoxy-4-carboxyphenol, 3-Methoxy-4-hydroxybenzoic acid, 4-Carboxyl-2-methoxyphenol, Methylprotocatechuic acid, NSC 3987, NSC 674322, VA, m-Methoxy-p-hydroxy-benzoic acid