1,3-Benzodioxole-5-carboxylic acid 3,4-Dioxymethylenebenzoic acid 3,4-Methylene dioxybenzoic acid 5-Benzodioxolecarboxylic acid 94-53-1 AI3-05972 Benzoic acid, 3,4-(methylenedioxy)- EINECS 202-342-8 Heliotropic acid NSC 10072 PIPERONYLIC ACID Protocatechuic acid methylene ether