.beta.-Thiopseudourea 2-Thiourea 62-56-6 NSC5033 Pseudothiourea Pseudourea, 2-thio- Sulourea THU Thiocarbamide Thiourea Thiuronium Urea, 2-thio- Urea, thio- Usaf ek-497 WLN: ZYZUS