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-ethyl-2-[(2-hydroxy-1-methylcyclohexyl)methyl]-3-[1-(2-methylpropanoyl)piperidin-4-yl]guanidine;hydroiodide into molecular formula.
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C20H39IN4O2
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