You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-chlorophenyl)-[(2R)-4-[6-(2-fluorophenoxy)pyrimidin-4-yl]-2-methylpiperazin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20ClFN4O2
assistant