1,3-Ethyleneurea 120-93-4 2-Imidazolidinone 2-Imidazolidone 2-Oxoimidazolidine Ethyleneurea Imidazolid-2-one N,N'-Ethyleneurea NSC3338 SD 6073 Urea, 1,3-ethylene- Urea, N,N'-(1,2-ethanediyl)- WLN: T5MVMTJ