You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named [2-(4-bromo-2-fluoroanilino)-2-oxoethyl] 2-ethyl-3,4-dihydro-1H-benzo[b][1,6]naphthyridine-10-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C23H21BrFN3O3
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