(8R,9S,10R,11S,13S,16R,17S)-11,16,17-三羟基-17-(2-羟基乙酰基)-10,13-二甲基-6,7,8,9,10,11, 12,13,16,17-十氢-3H-环戊[a]菲蒽-3-酮