You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name (3R)-4-(4-chloro-7-methylsulfonyl-5,6-dihydropyrrolo[2,3-d]pyrimidin-2-yl)-3-methylmorpholine into its molecular formula.
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C12H17ClN4O3S
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