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Cu-catalyzed oxidation of 5-hexyl-1,3-dihydroimidazo-2-one(1)in the presence of propylamine,as surrogates for the oxidized His side chain and Lys side chain,was investigated.5-Hexylidene-4-propylamino-1,5-dihydroimidazol-2-one(2),a model His-Lys cross-lin