You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(4-bromophenyl)-5-[(5-fluoro-3-oxo-1H-isoindol-2-yl)methyl]imidazolidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H13BrFN3O3
assistant