You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[2-(2-cyclopropyl-6-methylidenepiperidin-1-yl)-6,7,8,9-tetrahydro-5H-pyrimido[4,5-d]azepin-4-yl]-2-fluorophenol .
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C23H27FN4O
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