(2r,3r,4s,6s)-6-(((2r,3s,3s,4s,6s)-6-((((2r,3s,3s,4s,4s,6r)-6-(((3s,5r,8r,9s,10s,12r,13s,14s,17r)-12,14-二羟基-10,13-二甲基-17-(5-氧代-2,5,5-二氢呋喃-3-3-基)十六氢-1h-环[a]菲-3-基)氧基)-4-羟基-2-羟基-2-甲基-2h-吡喃-3-基-3-基)氧基-6-(((((3s,3s,5r,5r,5r,8r,8r,9s,9s-4-hydroxy-2-methyltetrah 17575-22-3