(1-Methylethyl)urea 1-Isopropylurea 4-04-00-00521 (Beilstein Handbook Reference) 691-60-1 AI3-52666 BRN 1743048 EINECS 211-722-2 ISOPROPYLUREA N-Isopropylurea NSC 14349 Urea, (1-methylethyl)- Urea, isopropyl-