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 4-[[4-[(1-methyl-2-methylsulfinylbenzimidazol-5-yl)methylamino]pyrimidin-2-yl]amino]benzenesulfonamide is given. What is its corresponding molecular formula?
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C20H21N7O3S2
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