1,3-Ethyleneurea 120-93-4 2-Imidazolidinone 2-Imidazolidone 2-Oxoimidazolidine 2-Oxomidazolidine 76895-63-1 AI3-22151 EINECS 204-436-4 ETHYLENEUREA Ethylene urea HSDB 4021 Monoethyleneurea N,N'-Ethyleneurea NSC 21314 SD 6073 Urea, 1,3-ethylene- Urea, N,N'-(1,2-ethanediyl)-