(2-(2,3-Dioxo-1-piperazinyl)ethyl)phenylimidazolidinetrione 132411-96-2 3-(beta-(2',3'-Diketopiperazine)ethylene)-2,4,5-imidazolidinetrione Imidazolidinetrione, (2-(2,3-dioxo-1-piperazinyl)ethyl)phenyl-