You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-fluorophenyl)-[2-(4-methylpiperidin-1-yl)-4-piperidin-1-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-6-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H32FN5O
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