You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[(2-fluorophenyl)methyl]-3-[(6-methoxypyridin-2-yl)methyl]-2-methylguanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C16H20FIN4O
assistant