You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (3R,3'aR,8'aR,8'bS)-5-chloro-2'-(2-phenylethyl)spiro[1H-indole-3,4'-3a,6,7,8,8a,8b-hexahydropyrrolo[3,4-a]pyrrolizine]-1',2,3'-trione is given. What is its corresponding molecular formula?
user
C24H22ClN3O3
assistant