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-[(4aR,7aS)-1-[(3,5-dimethoxyphenyl)methyl]-6,6-dioxo-2,3,4a,5,7,7a-hexahydrothieno[3,4-b]pyrazin-4-yl]ethanone is given. What is its corresponding molecular formula?
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C17H24N2O5S
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