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system
Name the molecular formula for the molecule established as N-(6-fluoro-3,4-dihydro-2H-thiochromen-4-yl)-2-(4-oxo-6-phenylthieno[2,3-d]pyrimidin-3-yl)acetamide using the IUPAC nomenclature.
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C23H18FN3O2S2
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