2,4-Imidazolidinedione, 5-ethyl-5-phenyl- (9CI) 5-Ethyl-5-phenyl-2,4-imidazolidinedione (9CI) 5-Ethyl-5-phenylhydantoin 631-07-2 EINECS 211-150-3 Ethylphenylhydantoin Hydantoin, 5-ethyl-5-phenyl- NSC 150466 Nirvanol