(3S,5S,8R,9S,10S,13S,14S,16R,17S)-17-(1-hydroxyethyl)-10,13-dimethyl-2 ,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenan threne-3,16-diol