You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (4R)-2-[4-(4-fluorophenyl)piperazin-1-yl]-6-oxo-N-[2-(trifluoromethyl)phenyl]-4,5-dihydro-1H-pyrimidine-4-carboxamide into its molecular formula.
user
C22H21F4N5O2
assistant