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 N,6-dichloro-N-[[3-[(dimethylamino)methyl]phenyl]methyl]-4-oxo-1H-quinoline-3-carboxamide is given. What is its corresponding molecular formula?
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C20H19Cl2N3O2
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