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 [2-(azepan-1-yl)-2-oxoethyl] 2-(5,6-dimethylthieno[2,3-d]pyrimidin-4-yl)sulfanylacetate is given. What is its corresponding molecular formula?
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C18H23N3O3S2
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