You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 1-[[1-(4-fluorophenyl)pyrazol-3-yl]methyl]-3-[2-(furan-2-yl)ethyl]-2-methylguanidine;hydroiodide into molecular formula.
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C18H21FIN5O
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