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-[(3-methyl-4-methylsulfonylphenyl)methyl]-3-(oxolan-2-ylmethyl)guanidine;hydroiodide into its molecular formula.
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C21H30IN3O4S
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