You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-[[5-fluoro-2-(methylsulfonylmethyl)phenyl]methyl]-2-methyl-3-[(2,3,5,6-tetrafluorophenyl)methyl]guanidine;hydroiodide is given. What is its corresponding molecular formula?
user
C18H19F5IN3O2S
assistant