You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-cyclohexyl-3-ethyl-2-[[6-(4-methylpiperidin-1-yl)pyridin-3-yl]methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H36IN5
assistant