You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[1-methyl-2-piperidin-4-yl-5-[3-(trifluoromethyl)phenyl]imidazol-4-yl]-2-methylsulfanylpyrimidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22F3N5S
assistant