You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-(5-ethyl-1,3-thiazol-2-yl)ethyl]-1-[2-(4-fluorophenoxy)ethyl]-1,2-dimethylguanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H26FIN4OS
assistant