3-N-(2-morpholinoethyl)-5,5-diphenylhydantoin
3-amino-5,5-diphenylimidazolidine-2,4-dione
phenythoin
3-Ethoxycarbonylmethyl-2,5-dioxo-4,4-diphenyl-imidazolidine-1-carboxylic acid ethyl ester
diethyl 2,2'-(2,4-dioxo-5,5-diphenylimidazolidine-1,3-diyl)diacetate