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Under IUPAC nomenclature, a molecule named N-[4-[[2-(3-ethyl-5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-2-yl)sulfanylacetyl]amino]-5-methoxy-2-methylphenyl]benzamide is given. What is its corresponding molecular formula?
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C27H28N4O4S2
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