You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(3,4-dimethylphenyl)methyl]-3,5-bis(trifluoromethyl)piperazin-1-yl]-phenylmethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22F6N2O
assistant