You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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5-N-(4-aminocyclohexyl)-3-bromo-7-N-(pyridin-3-ylmethyl)pyrazolo[1,5-a]pyrimidine-5,7-diamine is the IUPAC name of a molecule. Please give its molecular formula.
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C18H22BrN7
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