You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[1-[3-(benzenesulfonyl)pyrrolidin-1-yl]-1-oxopropan-2-yl]-3-chlorobenzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
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C19H21ClN2O5S2
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