You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule [2-(2-bromoanilino)-2-oxoethyl] 1-ethyl-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylate into molecular formula.
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C20H18BrN3O4
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