Synonyms: 2,4,6(1H,3H,5H)-Pyrimidinetrione, 5-ethyl-5-phenyl-, Barbituric acid, 5-ethyl-5-phenyl-, 5-Ethyl-5-phenylbarbituric acid, 5-Phenyl-5-ethylbarbituric acid, Adonal, Agrypnal, Amylofene, Barbenyl, Barbiphenyl, Barbipil, Barbita, Barbivis, Blu-phen, Cratecil, Dormiral, Doscalun, Duneryl, Eskabarb, Etilfen, Euneryl, Fenemal, Fenemal recip, Gardenal, Gardepanyl, Hysteps, Lepinal, Lepinaletten, Liquital, Lixophen, Lubergal, Luminal, Luminalum, NSC 128143, NSC 9848, Neurobarb, Noptil, Nunol, Phenaemal, Phenemal, Phenobar, Phenobarbital, Phenobarbitone, Phenobarbituric acid, Phenoluric, Phenonyl, Phenylethylbarbituric acid, Phenylethylmalonylurea, Phenyral, Phob, Sedonal, Sedophen, Sevenal, Solfoton, Somonal, Stental Extentabs, Talpheno, Teolaxin, Triphenatol, Versomnal, Primidone Impurity B