You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 1-[2-(3,4-dimethoxyphenyl)ethyl]-3-ethyl-2-[2-(2-fluorophenyl)ethyl]guanidine;hydroiodide is given. What is its corresponding molecular formula?
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C21H29FIN3O2
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