You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 2-[1-(benzenesulfonyl)-5-chloropyrrolo[3,2-b]pyridin-2-yl]ethoxy-tert-butyl-dimethylsilane into molecular formula.
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C21H27ClN2O3SSi
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