You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 6-[(4-methyl-3-nitrophenyl)methyl]-2-(2,3,4,5-tetrahydropyridin-6-yl)-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one .
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C20H23N5O3
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