2,4,6(1H,3H,5H)-Pyrimidinetrione, 5-butyl-5-(1-methylethyl)- 5-24-09-00178 (Beilstein Handbook Reference) 5-Butyl-5-isopropylbarbituric acid 53943-63-8 BARBITURIC ACID, 5-BUTYL-5-ISOPROPYL- BRN 0209358 NSC 120797 n-Butylisopropylbarbituric acid