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system
Name the molecular formula for the molecule established as N-[2-(dimethylamino)ethyl]-2-(1,3-dimethyl-2,6-dioxopurin-7-yl)-N-(4-methylsulfonyl-1,3-benzothiazol-2-yl)acetamide using the IUPAC nomenclature.
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C21H25N7O5S2
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