4H-Bisoxireno(1,8a:2,3)azuleno(4,5-b)furan-2(3H)-one, 4-(acetyloxy)octahydro-6-hydroxy-6,8a-dimethyl-3-methylene-, (3aR,4S,6R,6aS,7aR,7bS,8aR,8bS,8cS)- 69684-72-6