1,3-benzodioxole-5-carbaldehyde 1,3-benzodioxole-5-carboxaldehyde 120-57-0 3,4-METHYLEN-DIOXY-BENZALDEHYDE InChI=1/C8H6O3/c9-4-6-1-2-7-8(3-6)11-5-10-7/h1-4H,5H PIPERONAL