10180-86-6 Azuleno[6,5-b]furan-2,5-dione, 4-(acetyloxy)-3,3a,4,4a,7a,8,9,9a-octahydro-4a,8-dimethyl-3-methylene-, [3aR-(3a.alpha.,4.alpha.,4a.beta.,7a.alpha.,8.alpha.,9a.alpha.)]- HELANIN ACETATE NSC166124