You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1S,3R,3aS,6aR)-1-benzyl-3-(4-nitrophenyl)-5-phenyl-2,3,3a,6a-tetrahydro-1H-pyrrolo[3,4-c]pyrrole-4,6-dione into molecular formula.
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C25H21N3O4
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