You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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3-chloro-N-(3-chloropropylsulfonyl)-N-[2-(4-formylpyrazol-1-yl)-6-methylpyridin-4-yl]propane-1-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
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C16H20Cl2N4O5S2
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