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 2-N-[2-(1H-indol-3-yl)ethyl]-4-N-(3-methoxypropyl)pyridine-2,4-dicarboxamide is given. What is its corresponding molecular formula?
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C21H24N4O3
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