10.alpha.H-Ambros-11(13)-en-12-oic acid, 6.beta.-hydroxy-4-oxo-, .gamma.-lactone 1216-42-8 Ambrosin, dihydro- Azuleno[4,5-b]furan-2,9-dione, decahydro-6,9a-dimethyl-3-methylene-, [3aS-(3a.alpha.,6.beta.,6a.alpha.,9a.beta.,9b.alpha.)]- DAMSIN Damsine NSC85249