(5R,8R,9S,10S,13R,14S,17R)-17-[(E,2S,5S)-5-ethyl-6-methyl-hept-3-en-2-yl]-10,13-dimethyl-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-one