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system
Name the molecular formula for the molecule established as 1'-[5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4H-1,2-oxazol-3-yl]spiro[1H-2-benzofuran-3,3'-azetidine] using the IUPAC nomenclature.
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C20H14Cl2F4N2O2
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