MDMB-4en-PINACA explained

Iupac Name:methyl (S)-3,3-dimethyl-2-(1-(pent-4-en-1-yl)-1H-indazole-3-carboxamido)butanoate
Legal Br:F2
Legal Br Comment:[1]
Legal Ca:Schedule II
Legal De:Anlage II
Legal Uk:Class B
Cas Number:2504100-70-1
Unii:K2DZN2TDD6
Pubchem:155804661
Kegg:C22788
Chemspiderid:71117180
Smiles:O=C(N[C@@H](C(C)(C)C)C(OC)=O)C1=NN(CCCC=C)C2=C1C=CC=C2
Stdinchi:1S/C20H27N3O3/c1-6-7-10-13-23-15-12-9-8-11-14(15)16(22-23)18(24)21-17(19(25)26-5)20(2,3)4/h6,8-9,11-12,17H,1,7,10,13H2,2-5H3,(H,21,24)/t17-/m1/s1
Stdinchikey:LWOCBHBFWNGPGM-QGZVFWFLSA-N
C:20
H:27
N:3
O:3

MDMB-4en-PINACA[2] (also incorrectly known as 5-CL-ADB-A) is an indazole-based synthetic cannabinoid that has been sold online as a designer drug.[3] [4] [5] [6] [7] [8] MDMB-4en-PINACA was first identified in Europe in 2017.[9] In 2021, MDMB-4en-PINACA was the most common synthetic cannabinoid identified by the Drug Enforcement Administration in the United States.[10] MDMB-4en-PINACA differs from 5F-MDMB-PINACA due to replacement of 5-fluoropentyl with a pent-4-ene moiety (4-en).[11]

Pharmacology

It acts as a potent agonist of the CB1 receptor with an EC50 value of 2.47 nM.[12] [13] [14] [15] MDMB-4en-PINACA has been reported to be approximately 2.5x to 3x+ (2.47 nM, 239%) stronger (by CB1 activated β-arrestin 2 recruitment) than JWH-018 (25.3 nM, 100%) with over 10x the binding affinity than JWH-018 in vitro.[16]

In a review of in vitro MDMB-4en-PINACA studies showed an EC50 of 1.88–2.47 nM, an Emax of 221–299% (compared to JWH-018), and a Ki value of 0.28nM on the CB1 receptor[17] and appears to be 7x more selective for the CB2 receptor over the CB1 receptor[18] MDMB-4en-PINACA has an in vitro half-life of approximately 10 minutes[19] but has been reported in human urine samples up to an hour after consumption, producing 14 metabolites which may have their own pharmacological activity and be used in identification of MDMB-4en-PINACA consumption.[20]

Toxicity and compositions

There have been more than 15 deaths associated with use of MDMB-4en-PINACA[21]

MDMB-4en-PINACA has been implicated in the death of a 26 year old in combination with 4F-ABUTINACA (N-(4-fluorobutyl) APINACA). The deceased reported headache and angina before death and was noted to have a weak pulse and death-rattle like noisy breathing after collapsing to the floor. An autopsy 5 days after death found a peripheral blood content of 7.2 ng/mL of MDMB-4en-PINACA and 9.1 ng/mL of 4F-ABUTINACA and identified brain edema, internal congestion, petechial bleeding, pleural ecchymoses, and blood fluidity.[22]

MDMB-4en-PINACA has been implicated in the death of a 35 year old. An autopsy found MDMB-4en-PINACA and one of its metabolites (MDMB-4en-PINACA 3,3-dimethylbutanoic acid) in peripheral blood at a level of 0.4 μg/L and 5.7 μg/L and 0.5 μg/L and 11.6 μg/L in cardiac blood. Urine contained 2.1 μg/L for the metabolite, and a detection below level of quantification for MDMB-4en-PINACA itself.[23]

Adulterated Cannabis products in Europe that have been laced with MDMB-4en-PINACA have contained 0.3 to 4.6 μg/mg in seized flower samples and 1.7 to 7.2 μg/mg in hash/or other extract samples.[24]

Adulterated Cannabis products in Italy that have been laced with MDMB-4en-PINACA have contained 0.4 up to 6.3 mg/g[25]

MDMB-4en-PINACA has been detected in heroin and fentanyl sold on the streets in Massachusetts.[26]

MDMB-4en-PINACA powder can range in color from white or yellow or brown or orange.

The methyl 3,3-dimethylbutanoate "head" moiety of MDMB-4en-PINACA has been implicated in higher CB1 potency but also toxicity compared to other "head" moiety groups such as the naphthene "head" moiety of JWH-018 and AM-2201 and the 2,2,3,3-tetramethylcyclopropyl (or 3-tetramethylcyclopropylmethanone) "head" moiety of UR-144 and XLR-11[27]

Legal status

Sweden's public health agency suggested classifying MDMB-4en-PINACA as a hazardous substance, on December 18, 2019.[28]

In the United States, the DEA has temporarily placed MDMB-4en-PINACA into Schedule I status starting on December 12, 2023 for up to 2 years, during which it's possible the DEA could file for permanent scheduling within those 2 years. If the DEA does not file to permanent placement the temporary Schedule I order will expire on December 12, 2025.[29]

North Dakota has placed MDMB-4en-PINACA into Schedule I on 04/27/2023.[30]

See also

Notes and References

  1. Web site: Anvisa . Brazilian Health Regulatory Agency . 2023-07-24 . RDC Nº 804 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial . Collegiate Board Resolution No. 804 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control. live . https://web.archive.org/web/20230827163149/https://www.in.gov.br/en/web/dou/-/resolucao-rdc-n-804-de-24-de-julho-de-2023-498447451 . 2023-08-27 . 2023-08-27 . . pt-BR . 2023-07-25.
  2. Pulver B, Fischmann S, Gallegos A, Christie R . EMCDDA framework and practical guidance for naming synthetic cannabinoids . Drug Testing and Analysis . 15 . 3 . 255–276 . March 2023 . 36346325 . 10.1002/dta.3403 . 253396419 .
  3. Watanabe S, Vikingsson S, Åstrand A, Gréen H, Kronstrand R . Biotransformation of the New Synthetic Cannabinoid with an Alkene, MDMB-4en-PINACA, by Human Hepatocytes, Human Liver Microsomes, and Human Urine and Blood . The AAPS Journal . 22 . 1 . 13 . December 2019 . 31848852 . 10.1208/s12248-019-0381-3 . 209393242 .
  4. Web site: MDMB-4en-PINACA. www.caymanchem.com.
  5. Erol Ozturk Y, Yeter O . In Vitro Phase I Metabolism of the Recently Emerged Synthetic MDMB-4en-PINACA and Its Detection in Human Urine Samples . Journal of Analytical Toxicology . 44 . 9 . 976–984 . January 2021 . 32091101 . 10.1093/jat/bkaa017 . free .
  6. Wang Y, Pan Y, Yang H, Liu J, Wurita A, Hasegawa K . Quantification of MDMB-4en-PINACA and ADB-BUTINACA in human hair by gas chromatography-tandem mass spectrometry . Forensic Toxicology . 40 . 2 . 340–348 . July 2022 . 36454410 . 10.1007/s11419-022-00615-z . 247501663 .
  7. Wagmann L, Stiller RG, Fischmann S, Westphal F, Meyer MR . Going deeper into the toxicokinetics of synthetic cannabinoids: in vitro contribution of human carboxylesterases . Archives of Toxicology . 96 . 10 . 2755–2766 . October 2022 . 35788413 . 9352624 . 10.1007/s00204-022-03332-z . 250281976 .
  8. Giorgetti A, Brunetti P, Pelotti S, Auwärter V . Detection of AP-237 and synthetic cannabinoids on an infused letter sent to a German prisoner . Drug Testing and Analysis . 14 . 10 . 1779–1784 . October 2022 . 35918775 . 9804899 . 10.1002/dta.3351 . 251281159 . free .
  9. Web site: Expert Committee on Drug Dependence . October 2020 . World Health Organization . Critical Review Report: MDMB-4en-PINACA .
  10. Web site: Emerging Threat Report . Drug Enforcement Administration . 2021 .
  11. Web site: ANALYTICAL REPORT MDMB-PINACA N1-pentyl-4-en isomer. www.policija.si.
  12. Krotulski AJ, Cannaert A, Stove C, Logan BK . The next generation of synthetic cannabinoids: Detection, activity, and potential toxicity of pent-4en and but-3en analogues including MDMB-4en-PINACA . Drug Testing and Analysis . 13 . 2 . 427–438 . February 2021 . 32997377 . 10.1002/dta.2935 . 222148050 .
  13. Cannaert A, Sparkes E, Pike E, Luo JL, Fang A, Kevin RC, Ellison R, Gerona R, Banister SD, Stove CP . Synthesis and in Vitro Cannabinoid Receptor 1 Activity of Recently Detected Synthetic Cannabinoids 4F-MDMB-BICA, 5F-MPP-PICA, MMB-4en-PICA, CUMYL-CBMICA, ADB-BINACA, APP-BINACA, 4F-MDMB-BINACA, MDMB-4en-PINACA, A-CHMINACA, 5F-AB-P7AICA, 5F-MDMB-P7AICA, and 5F-AP7AICA . ACS Chemical Neuroscience . 11 . 24 . 4434–4446 . December 2020 . 33253529 . 10.1021/acschemneuro.0c00644 . 227246346 .
  14. Pike E, Grafinger KE, Cannaert A, Ametovski A, Luo JL, Sparkes E, Cairns EA, Ellison R, Gerona R, Stove CP, Auwärter V, Banister SD . Systematic evaluation of a panel of 30 synthetic cannabinoid receptor agonists structurally related to MMB-4en-PICA, MDMB-4en-PINACA, ADB-4en-PINACA, and MMB-4CN-BUTINACA using a combination of binding and different CB1 receptor activation assays: Part I-Synthesis, analytical characterization, and binding affinity for human CB1 receptors . Drug Testing and Analysis . 13 . 7 . 1383–1401 . July 2021 . 33787091 . 10.1002/dta.3037 .
  15. Grafinger KE, Cannaert A, Ametovski A, Sparkes E, Cairns E, Banister SD, Auwärter V, Stove CP . Systematic evaluation of a panel of 30 synthetic cannabinoid receptor agonists structurally related to MMB-4en-PICA, MDMB-4en-PINACA, ADB-4en-PINACA, and MMB-4CN-BUTINACA using a combination of binding and different CB1 receptor activation assays-Part II: Structure activity relationship assessment via a β-arrestin recruitment assay . Drug Testing and Analysis . 13 . 7 . 1402–1411 . July 2021 . 33769699 . 10.1002/dta.3035 .
  16. Krotulski AJ, Cannaert A, Stove C, Logan BK . The next generation of synthetic cannabinoids: Detection, activity, and potential toxicity of pent-4en and but-3en analogues including MDMB-4en-PINACA . Drug Testing and Analysis . 13 . 2 . 427–438 . February 2021 . 32997377 . 10.1002/dta.2935 . 222148050 .
  17. Simon G, Kuzma M, Mayer M, Petrus K, Tóth D . Fatal Overdose with the Cannabinoid Receptor Agonists MDMB-4en-PINACA and 4F-ABUTINACA: A Case Report and Review of the Literature . Toxics . 11 . 8 . 673 . August 2023 . 37624178 . 10458319 . 10.3390/toxics11080673 . free .
  18. Marusich JA, Gamage TF, Zhang Y, Akinfiresoye LR, Wiley JL . In vitro and in vivo pharmacology of nine novel synthetic cannabinoid receptor agonists . Pharmacology, Biochemistry, and Behavior . 220 . 173467 . October 2022 . 36154844 . 9837865 . 10.1016/j.pbb.2022.173467 .
  19. Book: Synthetic cannabinoids in Europe – a review . European Monitoring Centre for Drugs and Drug Addiction . 2021 . 978-92-9497-642-0 . 10.2810/911833 . European Monitoring Centre for Drugs and Drug Addiction. .
  20. Erol Ozturk Y, Yeter O . In Vitro Phase I Metabolism of the Recently Emerged Synthetic MDMB-4en-PINACA and Its Detection in Human Urine Samples . Journal of Analytical Toxicology . 44 . 9 . 976–984 . January 2021 . 32091101 . 10.1093/jat/bkaa017 .
  21. Web site: Risk Assessment Report on a new psychoactive substance: methyl 3,3-dimethyl-2-amino}butanoate (MDMB-4en-PINACA) ]. In accordance with Article 5c of Regulation (EC) No 1920/2006 (as amended) . The European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) . November 2020 . }
  22. Simon G, Kuzma M, Mayer M, Petrus K, Tóth D . Fatal Overdose with the Cannabinoid Receptor Agonists MDMB-4en-PINACA and 4F-ABUTINACA: A Case Report and Review of the Literature . Toxics . 11 . 8 . 673 . August 2023 . 37624178 . 10458319 . 10.3390/toxics11080673 . free .
  23. 10.1016/j.toxac.2022.06.142 . Dramatical outcome following the consumption of a joint containing the synthetic cannabinoid MDMB-4en-PINACA: A case report . 2022 . Arnault A, Meiries S, Mauras M, Navarette C, Berland E, Soumireu-Lartigue S . Toxicologie Analytique et Clinique . 34 . 3 . S93 .
  24. Monti MC, Zeugin J, Koch K, Milenkovic N, Scheurer E, Mercer-Chalmers-Bender K . Adulteration of low-delta-9-tetrahydrocannabinol products with synthetic cannabinoids: Results from drug checking services . Drug Testing and Analysis . 14 . 6 . 1026–1039 . June 2022 . 34997693 . 9305195 . 10.1002/dta.3220 .
  25. Gerace E, Seganti F, Di Corcia D, Vincenti M, Salomone A . GC-MS Identification and Quantification of the Synthetic Cannabinoid MDMB-4en- PINACA in Cannabis-derived Material Seized in the Turin Metropolitan Area (Italy) . Current Pharmaceutical Design . 28 . 32 . 2618–2621 . 2022 . 35658890 . 10.2174/1381612828666220603142859 . 249396142 .
  26. Web site: Synthetic Cannabinoid "MDMB-4en-PINACA" detected in Heroin/Fentanyl/Dope . Street Narcotic Update . Massachusetts Drug Supply Data Stream (MADDS) .
  27. Yano H, Chitsazi R, Lucaj C, Tran P, Hoffman AF, Baumann MH, Lupica CR, Shi L . Subtle Structural Modification of a Synthetic Cannabinoid Receptor Agonist Drastically Increases its Efficacy at the CB1 Receptor . ACS Chemical Neuroscience . 14 . 21 . 3928–3940 . November 2023 . 37847546 . 10623572 . 10.1021/acschemneuro.3c00530 . free .
  28. Web site: Tjugotre ämnen föreslås klassas som narkotika eller hälsofarlig vara . https://web.archive.org/web/20191219031304/https://www.folkhalsomyndigheten.se/nyheter-och-press/nyhetsarkiv/2019/december/tjugotre-amnen-foreslas-klassas-som-narkotika-eller-halsofarlig-vara/ . 19 December 2019 . Twenty-three substances are proposed to be classified as narcotics or health hazards . Folkhälsomyndigheten . The Public Health Authority . sv . 18 December 2019 .
  29. Web site: Federal Register :: Request Access .
  30. Web site: AN ACT to amend and reenact sections 19-03.1-05, 19-03.1-11, and 19-03.1-13 of the North Dakota Century Code, relating to the scheduling of controlled substances; and to declare an emergency. . Sixty-eighth Legislative Assembly of North Dakota in Regular Session . 3 January 2023 .

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