You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[2-[4-(2,6-difluoro-4-methylphenyl)-2,6-difluorophenyl]ethynyl]-1,2,3-trifluoronaphthalene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H11F7
assistant