You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (3aR,6aS)-5-acetyl-6a-hydroxy-3a-(4-methoxyphenyl)-2-(4-methylphenyl)-3,6-dihydropyrrolo[2,3-c]pyrrol-4-one is given. What is its corresponding molecular formula?
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C22H22N2O4
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