To elucidate the influence of the nature of N-acyl substituent on antioxidant properties of carcinine analogs, the corresponding histamine derivatives were synthesized. Antioxidant activity of the compounds prepared was investigated in the Fe(2+)-ascorbate-dependent system of oxidation of the linoleic acid micellar solution. Conformations of carnosine, carcinine, and their analogs were calculated by the molecular mechanics MM+ method. The structural elements and conformations that are preferable for the appearance of antioxidant activity were found.
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