You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,6aS)-3-acetyl-1,5-bis(4-chlorophenyl)-3a,6a-dihydropyrrolo[3,4-c]pyrazole-4,6-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H13Cl2N3O3
assistant