You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-2-[(3-fluoro-4-methylphenyl)methyl]-3-[(3-hydroxy-4-methoxyphenyl)methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H25FIN3O2
assistant