(+)-5-Ethyl-5-phenylhydantoin (+)-Nirvanol (S)-5-Ethyl-5-phenyl-2,4-imidazolidinedione (S)-Nirvanol 2,4-Imidazolidinedione, 5-ethyl-5-phenyl-, (S)- (9CI) 5-24-08-00092 (Beilstein Handbook Reference) 65567-34-2 BRN 0085311 Hydantoin, 5-ethyl-5-phenyl-, (+)- d-Nirvanol