2-Methyl-3-(3,4-methylenedioxyphenyl)-2-propenal 2-Piperonylidenepropanal 2-Propenal, 3-(1,3-benzodioxol-5-yl)-2-methyl- 3-Piperonylidenepropanal 6974-47-6 NSC23870 Piperonylidene propionaldehyde