1-(2-(4-Ethyl-2,3-dioxo-1-piperaziny)ethyl)-3-methylurea 77439-64-6 N-(2-(4-Ethyl-2,3-dioxo-1-piperazinyl)ethyl)-N'-methylurea Urea, N-(2-(4-ethyl-2,3-dioxo-1-piperazinyl)ethyl)-N'-methyl-