piperonylic acid1,3-dioxaindane-5-carboxylic acid2H-1,3-benzodioxole-5-carboxylic acid3,4-(methylenedioxy)benzoic acid3,4-dioxymethylenebenzoic acid3,4-methylenedioxybenzoic acid5-benzodioxolecarboxylic acidbenzo[d][1,3]dioxole-5-carboxylic acidheliotropic acidprotocatechuic acid methylene ether