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system
Name the molecular formula for the molecule established as (3R)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(2-chlorophenyl)-1-(2-methoxyethyl)pyrrolidine-2,5-dione using the IUPAC nomenclature.
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C21H25ClN2O4
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