(2R,3R,4bS,6aR,7S,7dS,8S,9aS,14bS,14cR,16aS)-2,3,5,6,6a,7,7d,8,9,9a,10,11,14,14b,14c,15,16,16a-Octadecahydro-14b,14c,17,17-tetramethyl-10-methylene-2-(1-methylethenyl)-7,8-(epoxymethano)-4bH-1-benzopyrano[5′,6′:6,7]indeno[1,2-b]cyclobuta[5,6]benz[1,2-e]indole-3,4b-diol