Acetic acid (3S,8R,9S,10R,13S,14S)-3-(tert-butyl-dimethyl-silanyloxy)-17-((Z)-(R)-2-cyclohexyloxy-1,5-dimethyl-hex-2-enyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-16-yl ester