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-3-(2-ethyl-2-hydroxybutyl)-2-[[4-methyl-2-(oxolan-3-yloxy)phenyl]methyl]guanidine;hydroiodide into molecular formula.
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C21H36IN3O3
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