You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-ethyl-2-[[5-fluoro-2-(methylsulfonylmethyl)phenyl]methyl]-3-[2-[3-(furan-2-yl)-1H-1,2,4-triazol-5-yl]ethyl]guanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C20H26FIN6O3S
assistant