You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-(3-chloro-4-methylphenyl)-4-(dimethylamino)-2-methyl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine-6-carboxamide ?
user
C18H22ClN5O
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