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 3-ethyl-2-[(4-methoxy-3-prop-2-ynoxyphenyl)methyl]-1-methyl-1-[(2-methyl-1,3-thiazol-4-yl)methyl]guanidine;hydroiodide into molecular formula.
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C20H27IN4O2S
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