You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N,N-dimethyl-6-oxo-1-[2-oxo-2-[4-[3-(trifluoromethyl)phenyl]piperazin-1-yl]ethyl]pyridine-3-sulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C20H23F3N4O4S
assistant