You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[4-(3,4-dimethoxyphenyl)sulfonylpiperazin-1-yl]-2-oxoethyl]-N,N-dimethylpyrrolidine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32N4O6S
assistant