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[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-12-tert-Butoxycarbonylamino-7-(9H-fluoren-9-ylmethoxycarbonylamino)-17-((R)-4-hydroxy-1-methyl-butyl)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-yl]-carbamic acid allyl ester