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 N-[3-cyano-2-[4-(difluoromethoxy)phenyl]-1-ethylindol-6-yl]ethanesulfonamide using the IUPAC nomenclature.
user
C20H19F2N3O3S
assistant