You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 7-fluoro-6-(4-methylpiperazin-1-yl)-3,11,21-triazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4,6,8,13,15,17,19-nonaen-10-one into molecular formula.
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C23H20FN5O
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