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McIntyre IM, Gary RD, Joseph S, Stabley R. 
“A Fatality Related to the Synthetic Opioid U-47700: Postmortem Concentration Distribution”. 
J Anal Toxicol. 2016 Oct 31.
In this case report, we present an evaluation of the distribution of postmortem concentrations of 3,4-dichloro-N-[2-(dimethylamino)cyclohexyl]-N-methylbenzamide (U-47700) in a fatality attributed principally to the drug. A man who had a history of drug abuse was found unresponsive and not breathing on his bed. Drug paraphernalia, indicating drug insufflation, was located in the decedent's room. Toxicology screening tests in peripheral blood initially identified U-47700 using an alkaline drug screen with gas chromatography-mass spectrometry (GC-MS) following solid-phase extraction. It was subsequently confirmed and quantitated by GC-MS-specific ion monitoring analysis following liquid-liquid extraction. The U-47700 peripheral blood concentration was quantitated at 190 ng/mL compared to the central blood concentration of 340 ng/mL. The liver concentration was 1,700 ng/g, the vitreous was 170 ng/mL, the urine was 360 ng/mL and the gastric contained only a trace amount (< 1 mg). Other drugs detected in peripheral blood were alprazolam (0.12 mg/L), nordiazepam (< 0.05 mg/L), doxylamine (0.30 mg/L), diphenhydramine (0.14 mg/L), ibuprofen (2.4 mg/L), salicylic acid (< 20 mg/L) and 11-nor-9-carboxy-delta-9-tetrahydrocannabinol (2.4 ng/mL). The cause of death was certified as acute U-47700 and alprazolam abuse, and the manner of death was certified as accident.
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