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-[1-(benzenesulfonyl)butan-2-yl]-2-ethyl-3-[1-(5-methylfuran-2-yl)ethyl]guanidine;hydroiodide .
user
C20H30IN3O3S
assistant