You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,3aS)-1-acetyl-7-chloro-2-(3,4-dimethoxyphenyl)spiro[2,3a-dihydro-1H-pyrrolo[1,2-a]quinoline-3,2'-indene]-1',3'-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H24ClNO5
assistant