Legal status
Legal status
  • Legal
CAS Number 157013-32-6 YesY
PubChem (CID) 154689
ChemSpider 136273
Chemical and physical data
Formula C16H23N5
Molar mass 285.387 g/mol
3D model (Jmol) Interactive image

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. PMID 8531107.
  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 Medicinal Chemistry. 38 (21): 4161–3. doi:10.1021/jm00021a004. PMID 7473542.
  3. US Patent 5502187 Pharmaceutically active bicyclic-heterocyclic amines

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