You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 6-fluoro-2-methyl-7-(3-methylmorpholin-4-yl)-1-[2-(oxan-4-yl)-2-oxoethyl]-2-(trifluoromethyl)-3H-imidazo[1,2-a]pyrimidin-5-one by IUPAC nomenclature, provide its molecular formula.
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C20H26F4N4O4
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