You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (3aS,4S,8aR,8bR)-4-(4-fluorobenzoyl)-2-(2-methyl-4-nitrophenyl)-4,6,7,8,8a,8b-hexahydro-3aH-pyrrolo[3,4-a]pyrrolizine-1,3-dione is given. What is its corresponding molecular formula?
user
C23H20FN3O5
assistant