You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-(2,3-difluorophenyl)ethyl]-1-ethyl-3-(3-methylbutan-2-yl)guanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C16H26F2IN3
assistant