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Methanesulfonic acid (S)-1-{(S)-1-[(3S,10S,13R,14R)-3-(tert-butyl-dimethyl-silanyloxy)-4,4,10,13,14-pentamethyl-2,3,4,5,6,7,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-ethyl}-4-methyl-pent-3-enyl ester