You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3aR,6aS)-1'-(4-methylbenzoyl)-5-(2-methylbutyl)spiro[3a,4,6,6a-tetrahydro-2H-pyrrolo[3,4-c]pyrrole-3,4'-piperidine]-1-one by IUPAC nomenclature, provide its molecular formula.
user
C23H33N3O2
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