You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 4-chloro-5-[[1-(2,6-dichlorophenyl)sulfonylpiperidin-4-yl]amino]-1-benzofuran-2-carboxylic acid is given. What is its corresponding molecular formula?
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C20H17Cl3N2O5S
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