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The interaction of tryptophan and its derivatives with the nitrogen-centered 2,2-diphenyl-1-picrylhydrazyl radical and oxygen-centered radicals formed during the radiolysis of oxygen-saturated ethanol and its aqueous solutions has been studied. It has been found that unlike pyrrole, indole, or melatonin, tryptophan, 5-hydroxytryptophan, serotonin, harman, harmine, and harmaline are capable of reducing...