You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 6-[[3-fluoro-5-(trifluoromethyl)phenyl]methyl]-2-pyridin-4-yl-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one by IUPAC nomenclature, provide its molecular formula.
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C20H16F4N4O
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