You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[3,5-dimethyl-4-[[2-(2-methylbenzimidazol-1-yl)ethylamino]methyl]pyrazol-1-yl]ethanol by IUPAC nomenclature, provide its molecular formula.
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C18H25N5O
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