You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-amino-4-[3-[[5-(3-oxopiperazine-1-carbonyl)pyridin-3-yl]methyl]pyrrolidin-1-yl]-1H-pyrimidin-6-one by IUPAC nomenclature, provide its molecular formula.
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C19H23N7O3
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