You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[N'-(2-benzylsulfinylethyl)-N-ethylcarbamimidoyl]piperazin-1-yl]-N-(2-methoxyethyl)acetamide;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H36IN5O3S
assistant