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 N-(7,7-dimethyl-9-oxo-6,8-dihydrodibenzofuran-2-yl)-4-fluorobenzenesulfonamide is given. What is its corresponding molecular formula?
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C20H18FNO4S
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