You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1R,3R,3aR,6aR)-1'-[(3,4-dichlorophenyl)methyl]-5-methyl-1-(2-methylpropyl)spiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-indole]-2',4,6-trione .
user
C25H25Cl2N3O3
assistant