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(4R)-tert-Butyldimethylsilyl 4-((3S,8R,9S,10S,13R,14S,17R)-10,13-Dimethyl-7-oxo-3-((tetrahydro-2H-pyran-2-yl)oxy)hexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate | Gentaur