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Name the molecular formula for the molecule established as [(8R,9S,10S,13S,14S)-10,13-dimethyl-17-oxo-1,2,3,4,5,6,7,8,9,11,12,14,15,16-tetradecahydrocyclopenta[a]phenanthren-3-yl] 2-bromoacetate using the IUPAC nomenclature.
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C21H31BrO3
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