You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[3-(azepan-1-yl)propyl]-1-ethyl-3-[2-(3-methylpyridin-4-yl)ethyl]guanidine;hydroiodide into molecular formula.
user
C20H36IN5
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