4-25-00-00449 (Beilstein Handbook Reference) 5-(1-Ethoxyethyl)-5-(1-methylbutyl)barbituric acid 5-Methyl-n-propylcarbinyl-5-ethoxyethylbarbituric acid 66941-23-9 BARBITURIC ACID, 5-(1-ETHOXYETHYL)-5-(1-METHYLBUTYL)- BRN 0263204