You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-chloro-4-methoxyphenyl)-2-[(1-methylsulfonylazetidin-3-yl)methyl]guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H20ClIN4O3S
assistant