You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(4-ethoxyphenyl)methyl]-3-ethyl-2-[(4-ethyl-1,2,4-triazol-3-yl)methyl]-1-methylguanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H29IN6O
assistant