You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[1-(3-fluoro-4-methoxyphenyl)ethyl]-3-[[3-(3-methoxypropoxy)phenyl]methyl]-2-methylguanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H31FIN3O3
assistant