2-Butanone, 4-(1,3-benzodioxol-5-yl)- 4-(1,3-Benzodioxol-5-yl)butan-2-one 4-(3,4-Methylenedioxyphenyl)-2-butanone 55418-52-5 AI3-20251 EINECS 259-630-1 FEMA No. 2701 NSC 405365 PIPERONYL ACETONE