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-N-methyl-N-[(5-methylfuran-2-yl)methyl]-3-pyrrolidin-1-ylsulfonylbenzamide is given. What is its corresponding molecular formula?
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C18H21ClN2O4S
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