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Title: U-89843a  
Author: World Heritage Encyclopedia
Language: English
Subject: Alcoholic beverage, Propylbarbital, SL-164, Carburazepam, Petrichloral
Collection: Gabaa Receptor Positive Allosteric Modulators, Pyrrolidines, Pyrrolopyrimidines, Sedatives
Publisher: World Heritage Encyclopedia


Systematic (IUPAC) name
Clinical data
Legal status
  • Legal
CAS number  YesY
ATC code ?
Chemical data
Formula C16H23N5 
Mol. mass 285.387 g/mol

U-89843A (PNU-89843) is a sedative drug which acts as an agonist at GABAA receptors, specifically acting as a positive allosteric modulator selective for the α1, α3 and α6 subtypes.[1] It has sedative effects in animals but without causing ataxia, and also acts as an antioxidant and may have neuroprotective effects.[2] It was developed by a team at Upjohn in the 1990s.[3]


  1. ^ Im, HK; Im, WB; Pregenzer, JF; Carter, DB; Hamilton, BJ (1995). "U-89843A is a novel allosteric modulator of gamma-aminobutyric acidA receptors". The Journal of Pharmacology and Experimental Therapeutics 275 (3): 1390–5.  
  2. ^ Bundy, GL; Ayer, DE; Banitt, LS; Belonga, KL; Mizsak, SA; Palmer, JR; Tustin, JM; Chin, JE et al. (1995). "Synthesis of novel 2,4-diaminopyrrolo-2,3-dpyrimidines with antioxidant, neuroprotective, and antiasthma activity". Journal of Medical Chemistry 38 (21): 4161–3.  
  3. ^ US Patent 5502187 Pharmaceutically active bicyclic-heterocyclic amines

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