553-21-9 COSTUNOLIDE Costunlide Costunolid Costus lactone Cyclodeca[b]furan-2(3H)-one, 3a,4,5,8,9,11a-hexahydro-6,10-dimethyl-3-methylene-, [3aS-(3aR*,6E,10E,11aS*)]- Germacra-1(10),4,11(13)-trien-12-oic acid, 6.alpha.-hydroxy-, .gamma.-lactone, (E,E)- NSC106404