You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3aS,6aR)-5-(2,6-dimethylphenyl)-3a,6a-dihydro-1H-pyrrolo[3,4-c]pyrazole-4,6-dione into molecular formula.
user
C13H13N3O2
assistant