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For the molecule named 1-[3-chloro-2,6-dinitro-4-(trifluoromethyl)phenyl]-6-[2-(2-ethoxyethoxy)ethoxy]-4-(trichloromethyl)-2H-pyrimidin-2-amine by IUPAC nomenclature, provide its molecular formula.
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C18H18Cl4F3N5O7
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