You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-[4-(3-bromo-4-methoxyphenyl)-2-oxo-1,3,4,5-tetrahydropyrimido[5,4-c]quinolin-6-yl]-4-oxobutanoic acid by IUPAC nomenclature, provide its molecular formula.
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C22H20BrN3O5
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