You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-fluoro-4-[9-(3-fluoro-4-propylsulfonyloxyphenyl)fluoren-9-yl]phenyl] propane-1-sulfonate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H28F2O6S2
assistant