5-24-05-00290 (Beilstein Handbook Reference) 69000-77-7 BRN 0899582 N-(2-Chloroethyl)-N'-(2-(4-ethyl-2,3-dioxo-1-piperazinyl)ethyl)-N-nitrosourea Urea, N-(2-chloroethyl)-N'-(2-(2,3-dioxo-4-ethyl-1-piperazinyl)ethyl)-N-nitroso-