Synonyms: 2,4,6(1H,3H,5H)-Pyrimidinetrione,5-ethyl-1-methyl-5-phenyl-, (S)-; Barbituric acid, 5-ethyl-1-methyl-5-phenyl-,(S)-(+)- (8CI); (+)-Mephobarbital; (+)-Methylphenobarbital;(+)-N-Methylphenobarbital; (S)-1-Methylphenobarbital; (S)-Mephobarbital;S-(+)-1-Methyl-5-ethyl-5-phenylbarbituric acid; S-Methylphenobarbital;d-1-Methylphenobarbital; d-Mephobarbital