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The abuse of synthetic opioids has become a major threat in recent years. Several clinical reports and fatal case reports exist discussing life-threatening hypoventilation and fatal respiratory depression following the abuse of trans-3,4-dichloro-N-(2-(dimethylamino)cyclohexyl)-N-methylbenzamide (U-47700). The reported concentration of U-47700 in peripheral blood varies between 0.01 μg/mL and 1.46 μg/mL...