2(3H)-Furanone, 5-(1,3-dimethyl-1-butenyl)dihydro- 5-(1,3-Dimethyl-1-butenyl)dihydrofuran-2(3H)-one 5-(1,3-Dimethylbut-1-enyl)furan-2-one 67800-85-5 EINECS 267-110-0