Synonyms: Furo[2',3':5,6]cyclohepta[1,2-c]pyran-2,7(3H,4H)-dione,5-ethoxyoctahydro-4a,9-dimethyl-3-methylene-, [3aR-(3aa,4ab,5a,8aa,9a,10aa)]-; Furo[2',3':5,6]cyclohepta[1,2-c]pyran-2,7(3H,4H)-dione, 5a-ethoxy-3aa,4a,5,8,8aa,9,10,10aa-octahydro-4ab,9a-dimethyl-3-methylene-, (-)- (8CI); Dehydrohymenolide;Hymenolide, dehydro-