You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[(1-ethylpiperidin-2-yl)methyl]-2-[[1-(trifluoromethylsulfonyl)piperidin-4-yl]methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H35F3IN5O2S
assistant