1,3-Benzodioxole-5-carboxylic acid 3,4-(Methylenedioxy)benzoic acid 3,4-Methylenedioxybenzoic acid 94-53-1 Benzoic acid, 3,4-(methylenedioxy)- Heliotropic acid NSC10072 PIPERONYLIC ACID Protocatechuic acid methylene ether