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 1-[4-[(1,5-dimethylpyrazol-4-yl)methylamino]-2-pyridin-2-yl-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-7-yl]ethanone is given. What is its corresponding molecular formula?
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C20H23N7O
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