You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[[N-[2-(4-chlorophenyl)sulfanylethyl]-N'-methylcarbamimidoyl]amino]methyl]-N,N-dimethylbenzamide;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26ClIN4OS
assistant