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(3R,5S,8R,9S,10R,13S,14S)-3-((tert-Butyldimethylsilyl)oxy)-10,13-dimethyl-5,6,7,8,9,10,11,12,13,14,15,16-dodecahydro-3H-cyclopenta[a]phenanthren-17(4H)-one | Gentaur