You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3aS,4R,9aR,9bS)-8-benzoyl-4-(4-bromobenzoyl)-2-(3-fluorophenyl)-3a,4,9a,9b-tetrahydropyrrolo[3,4-a]indolizine-1,3-dione .
user
C30H20BrFN2O4
assistant