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-(3,4-dimethoxyphenyl)-2-[[6-(3-fluorophenoxy)pyridin-3-yl]methyl]guanidine;hydroiodide is given. What is its corresponding molecular formula?
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C21H22FIN4O3
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