You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-[2-(2,6-difluorophenyl)ethyl]-2-methyl-3-[2-(4-methylsulfonylphenyl)ethyl]guanidine using the IUPAC nomenclature.
user
C19H23F2N3O2S
assistant