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For the molecule named 3-[2-[1-[5-chloro-6-(2,2,2-trifluoroethoxy)pyridin-3-yl]ethylamino]pyrimidin-4-yl]-4,4-dimethyl-1,3-oxazolidin-2-one by IUPAC nomenclature, provide its molecular formula.
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C18H19ClF3N5O3
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