Synonyms: Hydanphene;64217-16-9;Hydanphen;AC1L5AS1;8017-26-3 (mono-hydrochloride salt);5,5-diphenylimidazolidine-2,4-dione; 5-ethyl-5-phenyl-1,3-diazinane-2,4,6-trione;2,4,6(1H,3H,5H)-Pyrimidinetrione, 5-ethyl-5-phenyl-, mixt. with 5,5-diphenyl-2,4-imidazolidinedione;5,5-diphenylimidazolidine-2,4-dione - 5-ethyl-5-phenylpyrimidine-2,4,6(1H,3H,5H)-trione (1:1)