You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[3-(3-chlorophenyl)-1,2,4-oxadiazol-5-yl]methyl]-1-ethyl-3-(1-prop-2-enylpiperidin-4-yl)guanidine;hydroiodide into molecular formula.
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C20H28ClIN6O
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