Synonyms: Spiro[10H-8,10a-epoxy-2H-furo[3',2':5,6]cyclohept[1,2-c]oxepin-3(3aH),10'-[5H-2,4a]ethano[2H]oxireno[3a,4]azuleno[6,5-b]furan]-2,8'(9'H)-dione,4,6',6'a,8,9'a,9'b,11,11a-octahydro-2',5',8,9'-tetramethyl-, [2'R-[1'aS*,2'a,4'aa,5'b,6'aa,9'a,9'aa,9'bb,10'R*(3aR*,8R*,10aS*,11aR*)]]-;Ornativolide