You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-(furan-2-yl)ethyl]-2-[(4-methoxyoxan-4-yl)methyl]-3-(3-morpholin-4-ylpropyl)guanidine;hydroiodide into its molecular formula.
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C21H37IN4O4
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