You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 1-[(4-chloro-1-methylpyrrol-2-yl)methyl]-3-ethyl-1-methyl-2-[[2-[(2-oxopyrrolidin-1-yl)methyl]phenyl]methyl]guanidine;hydroiodide into its molecular formula.
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C22H31ClIN5O
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