5,6-Dimethoxy-2-formylbenzoic acid 5,6-Dimethoxyphthalaldehydic acid 519-05-1 6-Formyl- 2,3-dimethoxybenzoic acid Benzoic acid, 6-formyl-2,3-dimethoxy- (9CI) EINECS 208-261-4 NSC 35546 Opianic acid Phthalaldehydic acid, 5,6-dimethoxy- (8CI) o-Veratric acid, 6-formyl-