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(R)-6-{(S)-1-[(1S,3R,8S,9S,10R,13S,14S)-3-(tert-Butyl-dimethyl-silanyloxy)-1-hydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-ethyl}-3,4-dimethyl-5,6-dihydro-pyran-2-one