You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[1-(3-chloropyridin-2-yl)pyrrolidin-3-yl]-3-ethyl-2-(pyridin-2-ylmethyl)guanidine;hydroiodide into molecular formula.
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C18H24ClIN6
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