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 1-[4-benzyl-2-[[4-(methylsulfonylmethyl)cyclohexyl]amino]pyrimidin-5-yl]ethanone is given. What is its corresponding molecular formula?
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C21H27N3O3S
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