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Abstract: N‐[2‐(6‐methoxyquinazolin‐4‐yl)‐ethyl] acetamide (MQA) is a compound formed from the melatonin metabolite N1‐acetyl‐5‐methoxykynuramine (AMK). We followed MQA production in reaction systems containing various putative reaction partners, in the absence and presence of hydrogen peroxide and/or copper(II). Although MQA may be formally described as a condensation product of either N1‐acetyl‐...