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-[2-[4-(4-chloro-3-fluorophenyl)piperidin-4-yl]ethoxy]-2,5-difluoro-N-(1,2,4-thiadiazol-5-yl)benzenesulfonamide is given. What is its corresponding molecular formula?
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C21H20ClF3N4O3S2
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