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system
Name the molecular formula for the molecule established as ethyl 3-[2-[(2-chloro-6-fluorophenyl)methyl-methylamino]-2-oxoethyl]-6-methyl-4-oxofuro[2,3-d]pyrimidine-5-carboxylate using the IUPAC nomenclature.
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C20H19ClFN3O5
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