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,4R,6aR)-5-methylsulfonyl-4-phenyl-1,3,3a,4,6,6a-hexahydropyrrolo[3,4-c]pyrrol-2-yl]-(4,6-dimethylpyrimidin-5-yl)methanone into molecular formula.
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C20H24N4O3S
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