You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(3,4-dimethylphenyl)-1,1,1,3,3,3-hexafluoropropan-2-yl]-2,4-dimethylbenzene is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18F6
assistant