3,4-Dimethoxybenzoic acid 3,4-Dimethylprotocatechuic acid 4-10-00-01460 (Beilstein Handbook Reference) 93-07-2 BRN 0518285 Benzoic acid, 3,4-dimethoxy- Dimethylprotocatechuic acid EINECS 202-215-7 NSC 7721 VERATRIC ACID