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-ethyl-2-[2-(3-fluorophenoxy)butyl]-3-[2-(3-propan-2-yl-1,2,4-oxadiazol-5-yl)ethyl]guanidine;hydroiodide into molecular formula.
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C20H31FIN5O2
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