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-oxo-N-[2-[[6-(pyridin-4-ylamino)pyridazin-3-yl]amino]ethyl]-3,4-dihydro-1H-quinoline-6-sulfonamide is given. What is its corresponding molecular formula?
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C20H21N7O3S
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