You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule S-(fluoromethyl) (8R,9S,10R,13R,14S,17S)-13-(hydroxymethyl)-10-methyl-3-oxo-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthrene-17-carbothioate into molecular formula.
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C21H27FO3S
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