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 N-ethyl-6-[3-(hydroxymethyl)pyrrolidin-1-yl]-N-[(1-methylimidazol-2-yl)methyl]pyridine-3-carboxamide into molecular formula.
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C18H25N5O2
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