You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,4-difluoro-N-[5-[3-(3-hydroxy-3-methylbut-1-ynyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]-2-methoxypyridin-3-yl]benzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
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C22H18F2N6O4S
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