You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[2-oxo-2-[4-[2-(trifluoromethyl)benzoyl]piperazin-1-yl]ethoxy]phenyl]acetonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20F3N3O3
assistant