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 3,5-dichloro-4-[5-[2-(1H-imidazol-5-yl)ethylamino]-2-methyl-4-oxo-1,7-naphthyridin-1-yl]benzonitrile is given. What is its corresponding molecular formula?
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C21H16Cl2N6O
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