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'-bromo-8'-chloro-5-fluorospiro[1,2-dihydroindene-3,3'-2H-imidazo[1,5-a]pyridine]-1',5'-dione .
user
C15H9BrClFN2O2
assistant