7-[3-[3,5-bis(phenylmethoxy)phenyl]prop-2-enyl]-17-[tert-butyl(dimethyl)silyl]oxy-10,13-dimethyl-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-one