You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 7-(1,3-dimethylpyrazol-4-yl)-N-[4-(4-methylpiperazin-1-yl)phenyl]pyrrolo[2,1-f][1,2,4]triazin-2-amine by IUPAC nomenclature, provide its molecular formula.
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C22H26N8
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