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 3-acetyl-8-bromo-5-chloro-2-[(6-pyrazol-1-ylpyridin-3-yl)methylsulfinyl]-1H-quinolin-4-one is given. What is its corresponding molecular formula?
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C20H14BrClN4O3S
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