Synonyms: Protocatechuicacid, 5-methoxy- (6CI,7CI,8CI); 3,4-Dihydroxy-5-methoxybenzoic acid;3-Methoxy-4,5-dihydroxybenzoic acid; 3-Methoxygallic acid; 3-O-Methylgallicacid; 4,5-Dihydroxy-3-methoxybenzoic acid; 4,5-Dihydroxy-m-anisic acid;5-Hydroxyvanillic acid; 5-Methoxygallic acid; Gallic acid 3-methyl ether