You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-(1-benzyl-5-methylpyrrolidin-3-yl)-3-[[3-(furan-2-yl)-1H-1,2,4-triazol-5-yl]methyl]-2-methylguanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C21H28IN7O
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