You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (1S)-2,2-difluoro-1-[6-[4-(trifluoromethyl)phenyl]pyridin-2-yl]-6-azaspiro[2.5]octane-6-sulfonamide into molecular formula.
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C19H18F5N3O2S
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