(9r,10s,11s,13s,16r,17r)-9-氟-11-羟基-17-(2-羟基乙酰基)-10,13,16-三甲基-3-氧代-6,7,8,9,10,11,12,13,14,15,16,17-十二氢-3h-环戊[a]菲-17-基丙酸酯