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-[5-[[(1R)-1-(4-ethylphenyl)ethyl]sulfamoyl]-2-methylsulfanylphenyl]-2-methylpropanamide using the IUPAC nomenclature.
user
C21H28N2O3S2
assistant