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(S)-2-[(3S,8R,9S,10R,13S,14S,16R,17S)-3-(tert-Butyl-dimethyl-silanyloxy)-16,17-dihydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-propionic acid isobutyl ester