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 2-(dimethylamino)-7-(2-hydroxy-4-methylbenzoyl)-5,6,8,9-tetrahydro-3H-pyrimido[4,5-d]azepin-4-one ?
user
C18H22N4O3
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