You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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3-[(1-benzyl-5-methylpyrrolidin-3-yl)methyl]-1-[(4-bromo-1-methylpyrrol-2-yl)methyl]-1,2-dimethylguanidine is the IUPAC name of a molecule. Please give its molecular formula.
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C22H32BrN5
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