4-[(3S,5R,8R,9S,10S,12R,13S,14S,17R)-3-[(2R,4S,5S,6R)-4,5-二羟基-6-甲基四氢吡喃-2-基]氧基-12,14-二羟基-10,13-二甲基-1,2,3,4,5,6,7,8,9,11,12,15,16,17-十四氢环戊烯并[a]菲-17-基]-5H-呋喃-2-酮