You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(3,4-dimethoxyphenyl)ethyl]-1,2-dimethyl-3-[(1-methylpiperidin-3-yl)methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H35IN4O2
assistant