1-(2-Hydroxyethyl)-2-imidazolidinone 1-(2-Hydroxyethyl)imidazolidin-2-one 2-Imidazolidinone, 1-(2-hydroxyethyl)- 3699-54-5 AI3-24563 EINECS 223-032-9 Hydroxyethylethyleneurea NSC 5775