1-Butyl-2-thiourea 1516-32-1 4-04-00-00584 (Beilstein Handbook Reference) BRN 1744779 Butyl-2-thiourea Butylthiourea EINECS 216-165-9 N-Butylthiourea NSC 202953 Thiourea, butyl- USAF D-5 Urea, 1-butyl-2-thio- n-Butyl thiourea