You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-formyl-N,N-dimethyl-1-[2-[[5-(6-methylpyridin-3-yl)pyridin-2-yl]amino]-2-oxoethyl]-2,3,4,7-tetrahydroazepine-6-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C23H27N5O3
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