You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,6aS)-5-[(2-chlorophenyl)methyl]-6',7'-dimethyl-1-propan-2-ylspiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H26ClN3O3
assistant