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Carfentanil (also known as Carfentanyl; 4-carbomethoxyfentanyl; R33799) is an analog of the synthetic opioid analgesic Fentanyl. Carfentanil was first synthesized in 1974 by a team of chemists at Janssen Pharmaceutica which included Paul Janssen.
Carfentanil is comprised of a carboxymethyl group in the fourth position of the piperidine ring of fentanyl. Fentanyl‐related substances, including carfentanil, have been identified in powder, tablet, or capsule formulations as well as in liquid form and on blotter paper.
Carfentanil can be pharmacologically active via multiple routes of administration, including orally, intranasally, subcutaneously, intravenously, and intramuscularly. Due to its high potency, carfentanil also can be easily absorbed through the skin or inhaled.
Carfentanil has formal name: Methyl 1-(2-phenylethyl)-4-[phenyl(propanoyl)amino]piperidine-4-carboxylate. The chemical formula for Carfentanil is C24H30N2O3 with a molecular weight of 394.515
The effect of Carfentanil exceeds Fentanyl and Morphine in 100 and 10000 times, respectively. Median analgesic activity of ED50 for Carfentanil with intravenous administration to rats is 0.41 μg / kg, the effect on the human body begins already with 1 μg.
The toxicity and long-term health effects of recreational Carfentanil use do not seem to have been studied in any scientific context and the exact toxic dosage is unknown.
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Carfentanil is intended for research and forensic purposes in a controlled laboratory for study only and is NOT intended for human consumption.
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