4-[(3S,5R,8R,9S,10S,13R,17R)-3-[(2R,3R,4R,5S)-3,4-二羟基-5-(羟基甲基)四氢呋喃-2-基]氧基-14-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