1(3H)-ISOBENZOFURANONE, 3-BUTYLIDENE- 3-Butylidene phthalide 3-Butylidene-1(3H)-isobenzofuranone 3-Butylidenephthalide 551-08-6 AI3-37306 BdPh Butylidene phthalide Butylidenephthalide EINECS 208-991-3 FEMA No. 3333 Ligusticum lactone NSC 325307 Phthalide, 3-butylidene- n-Butylidene phthalide