You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 6-[2-(3,4-difluorophenyl)ethynyl]-2-(2,6-difluoro-4-propylphenyl)-1,2,3,4-tetrahydronaphthalene .
user
C27H22F4
assistant