tetrabarbital tetrabarbital tetrabarbital (inn; butysal, butysedal, tetramal) is a barbiturate derivative used as a hypnotic. tetrabarbitalclinical dataatc codenoneidentifiers iupac name 5-ethyl-5-(hexan-3-yl)pyrimidine-2,4,6(1h,3h,5h)-trione cas number76-23-3pubchem cid101534chemspider91745unii3k441526foecha infocard100.000.861 chemical and physical dataformulac12h20n2o3molar mass240.303 g·mol−13d model (jsmol)interactive image smiles o=c1nc(=o)nc(=o)c1(c(cc)ccc)cc inchi inchi=1s/c12h20n2o3/c1-4-7-8(5-2)12(6-3)9(15)13-11(17)14-10(12)16/h8h,4-7h2,1-3h3,(h2,13,14,15,16,17)key:zlunggzjsqdfph-uhfffaoysa-n