u-89843a u-89843a 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. it has sedative effects in animals but without causing ataxia, and also acts as an antioxidant and may have neuroprotective effects. it was developed by a team at upjohn in the 1990s. u-89843alegal statuslegal status in general: legal identifiers iupac name 6,7-dimethyl-2,4-dipyrrolidin-1-yl-7h-pyrrolopyrimidine cas number157013-32-6 ypubchem cid154689chemspider136273unii7z7pks2mxzcomptox dashboard (epa)dtxsid80166193 chemical and physical dataformulac16h23n5molar mass285.395 g·mol−13d model (jsmol)interactive image smiles cc1=cc2=c(n1c)n=c(n=c2n3cccc3)n4cccc4 inchi inchi=1s/c16h23n5/c1-12-11-13-14(19(12)2)17-16(21-9-5-6-10-21)18-15(13)20-7-3-4-8-20/h11h,3-10h2,1-2h3key:uadikeuoamacna-uhfffaoysa-n (verify)