2(3H)-FURANONE, 5-(1,2-HEPTADIENE-4,6-DIYNYL)DIHYDRO- 4-17-00-05182 (Beilstein Handbook Reference) 5-(1,2-Heptadiene-4,6-diynyl)dihydro-2(3H)-furanone 502-12-5 BRN 0125855 Nemotin