You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[5-(4-bromophenyl)furan-2-yl]methylidene]-3-[(4-chlorophenyl)methyl]imidazolidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H14BrClN2O3
assistant