You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[1-[5-fluoro-2-(4-methylpiperazin-1-yl)phenyl]ethyl]-2-(3-oxo-6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-2-yl)acetamide by IUPAC nomenclature, provide its molecular formula.
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C22H31FN6O2
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