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 2,3-dichloro-N-[2,6-difluoro-4-[2-(5-fluoropyridin-3-yl)ethynyl]phenyl]benzenesulfonamide is given. What is its corresponding molecular formula?
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C19H9Cl2F3N2O2S
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