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 (5S)-N'-[3-(benzenesulfonyl)propanoyl]-5-ethyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carbohydrazide into molecular formula.
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C20H24N2O4S2
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