You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2E)-5-bromo-2-[(3-fluorophenyl)methylidene]-6,7-dimethyl-[1,3]thiazolo[3,2-a]benzimidazol-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H12BrFN2OS
assistant