(1R,2S,3R,3aR,3a1R,4R,6aR,7aS,11S,11aS,11bR)-1,2,3a,4,11-五羟基-3,8,11a-三甲基-1,2,3,3a,4,7,7a,11,11a,11b-十氢-5H-3,3a1-(环氧甲桥基)二苯并[de,g]色烯-5,10(6aH)-二酮