You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[(5-chlorothiophen-2-yl)methyl]-3-ethyl-2-[2-(furan-2-yl)-2-hydroxyethyl]-1-methylguanidine;hydroiodide into molecular formula.
user
C15H21ClIN3O2S
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