Cannabis Ruderalis

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  • methyl (S)-3,3-dimethyl-2-(1-(pent-4-en-1-yl)-1H-indazole-3-carboxamido)butanoate
CAS Number
PubChem CID
Chemical and physical data
Molar mass357.454 g·mol−1
3D model (JSmol)
  • O=C(N[C@@H](C(C)(C)C)C(OC)=O)C1=NN(CCCC=C)C2=C1C=CC=C2
  • InChI=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

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

It acts as a potent agonist of the CB1 receptor with an EC50 value of 2.47 nM.[10][11][12][13]

Legal status[edit]

Sweden's public health agency suggested classifying MDMB-4en-PINACA as a hazardous substance, on December 18, 2019.[14]

In the United States, the DEA has filed a notice for its intent to temporarily place MDMB-4en-PINACA into Schedule I status starting on or after May 4th, 2023 for up to 2 years, during which it's possible the DEA could file for permanent scheduling within those 2 years. If it's filed on May 4, 2023, and the DEA does not file to permanent placement the temporary Schedule I order will expire on May 4, 2025.[15]

North Dakota has placed MDMB-4en-PINACA into Schedule I on 04/27/2023.[16]

See also[edit]


  1. ^ Anvisa (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] (in Brazilian Portuguese). Diário Oficial da União (published 2023-07-25). Archived from the original on 2023-08-27. Retrieved 2023-08-27.
  2. ^ Watanabe S, Vikingsson S, Åstrand A, Gréen H, Kronstrand R (December 2019). "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. doi:10.1208/s12248-019-0381-3. PMID 31848852. S2CID 209393242.
  3. ^ "MDMB-4en-PINACA".
  4. ^ Erol Ozturk Y, Yeter O (January 2021). "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. doi:10.1093/jat/bkaa017. PMID 32091101.
  5. ^ Wang Y, Pan Y, Yang H, Liu J, Wurita A, Hasegawa K (July 2022). "Quantification of MDMB-4en-PINACA and ADB-BUTINACA in human hair by gas chromatography-tandem mass spectrometry". Forensic Toxicology. 40 (2): 340–348. doi:10.1007/s11419-022-00615-z. PMID 36454410. S2CID 247501663.
  6. ^ Wagmann L, Stiller RG, Fischmann S, Westphal F, Meyer MR (October 2022). "Going deeper into the toxicokinetics of synthetic cannabinoids: in vitro contribution of human carboxylesterases". Archives of Toxicology. 96 (10): 2755–2766. doi:10.1007/s00204-022-03332-z. PMC 9352624. PMID 35788413. S2CID 250281976.
  7. ^ Giorgetti A, Brunetti P, Pelotti S, Auwärter V (October 2022). "Detection of AP-237 and synthetic cannabinoids on an infused letter sent to a German prisoner". Drug Testing and Analysis. 14 (10): 1779–1784. doi:10.1002/dta.3351. PMC 9804899. PMID 35918775. S2CID 251281159.
  8. ^ "Emerging Threat Report" (PDF). Drug Enforcement Administration. 2021.
  9. ^ "ANALYTICAL REPORT MDMB-PINACA N1-pentyl-4-en isomer" (PDF).
  10. ^ Krotulski AJ, Cannaert A, Stove C, Logan BK (February 2021). "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. doi:10.1002/dta.2935. PMID 32997377. S2CID 222148050.
  11. ^ Cannaert A, Sparkes E, Pike E, Luo JL, Fang A, Kevin RC, et al. (December 2020). "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. doi:10.1021/acschemneuro.0c00644. PMID 33253529. S2CID 227246346.
  12. ^ Pike E, Grafinger KE, Cannaert A, Ametovski A, Luo JL, Sparkes E, et al. (July 2021). "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. doi:10.1002/dta.3037. PMID 33787091.
  13. ^ Grafinger KE, Cannaert A, Ametovski A, Sparkes E, Cairns E, Banister SD, et al. (July 2021). "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. doi:10.1002/dta.3035. PMID 33769699.
  14. ^ "Tjugotre ämnen föreslås klassas som narkotika eller hälsofarlig vara" [Twenty-three substances are proposed to be classified as narcotics or health hazards]. Folkhälsomyndigheten [The Public Health Authority] (in Swedish). 18 December 2019. Archived from the original on 19 December 2019.
  15. ^ "Federal Register :: Request Access".
  16. ^ "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" (PDF). Sixty-eighth Legislative Assembly of North Dakota in Regular Session. 3 January 2023.

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