You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[2-(benzylsulfamoyl)ethyl]-3-[5-(diethylamino)pentan-2-yl]-2-methylguanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C20H38IN5O2S
assistant