You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[4-[6-methyl-2-[4-(trifluoromethyl)phenyl]pyrimidin-4-yl]piperazin-1-yl]butan-1-one ?
user
C20H23F3N4O
assistant