You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule N-[2-chloro-6-(trifluoromethyl)phenyl]-2-[4-(3,4-dimethylphenyl)sulfonylpiperazin-1-yl]acetamide ?
user
C21H23ClF3N3O3S
assistant