You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-ethyl-2-[3-[ethyl(methylsulfonyl)amino]propyl]-3-[2-(2-methoxyphenyl)ethyl]guanidine;hydroiodide .
user
C18H33IN4O3S
assistant