You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5E)-5-[(4-bromophenyl)methylidene]-3-(4-chlorophenyl)-2-(4-methoxyphenyl)imidazol-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H16BrClN2O2
assistant