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Name the molecular formula for the molecule established as 1-[1-(5,7-difluoro-3-methyl-1-benzofuran-2-yl)-2,2,2-trifluoroethyl]-3-[2-(3-oxopiperazin-1-yl)pyrimidin-5-yl]urea using the IUPAC nomenclature.
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C20H17F5N6O3
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