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Name the molecular formula for the molecule established as 10-[(2-chloro-6-fluorophenyl)methoxy]-13-ethyl-4-methoxy-11-methyl-2,4,8,13-tetrazatricyclo[7.4.0.02,6]trideca-1(9),5,7,11-tetraene using the IUPAC nomenclature.
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C20H22ClFN4O2
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