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 [(2S)-1-(6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)-3-methyl-1-oxobutan-2-yl] 1H-indole-3-carboxylate is given. What is its corresponding molecular formula?
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C21H22N2O3S
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