You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-[3-(2,3-difluorophenyl)sulfonylpyrrolidin-1-yl]-2-[4-(hydroxymethyl)phenoxy]ethanone by IUPAC nomenclature, provide its molecular formula.
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C19H19F2NO5S
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