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 2-[[(2S)-butan-2-yl]amino]-N-[2-chloro-5-[ethyl(phenyl)sulfamoyl]phenyl]acetamide using the IUPAC nomenclature.
user
C20H26ClN3O3S
assistant