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Translate the chemical IUPAC name 2-[(5,6-dimethylthieno[2,3-d]pyrimidin-4-yl)amino]-N-[(5-ethoxy-2-methyl-2,3-dihydro-1-benzofuran-6-yl)methyl]propanamide into its molecular formula.
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C23H28N4O3S
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