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-[(2,4-dimethoxyphenyl)methyl]-3-[2-(3-methoxyphenyl)ethyl]-1,2-dimethylguanidine;hydroiodide .
user
C21H30IN3O3
assistant