Piperonylic acid Molecular Weight: 166.133 g/mol Cas Number: 94-53-1 SMILES: C(C2=CC=C1OCOC1=C2)(=O)O Catalog Number:FR-1276H1 NMR SpectrumPredict NMR spectrumSynonym Name:3,4-Methylenedioxybenzoic acid; benzo[1,3]dioxole-5-carboxylic acid; 1,3-benzodioxole-5-carboxylic acid