You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[2-(3,4-dimethoxyphenyl)ethyl]-3-[(3-methoxy-5-methylphenyl)methyl]-2-methylguanidine;hydroiodide .
user
C21H30IN3O3
assistant