You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-[4-chloro-3-(dimethylsulfamoyl)anilino]-2-oxoethyl] 5-chloro-3-methyl-1-benzofuran-2-carboxylate into its molecular formula.
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C20H18Cl2N2O6S
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