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-(3-butoxy-2,2-dimethylcyclobutyl)-3-(1-cyclopropylpiperidin-4-yl)-2-ethylguanidine;hydroiodide into molecular formula.
user
C21H41IN4O
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