“…1 Derivatives of cyclic urea are of special interest as building blocks in synthetic organic chemistry, 2-5 unique organic ligands, 6-9 solvents and co solvents. 10, 11 These compounds exhibit considerable anti bacterial, 12,13 sedative hypnotic, 14, 15 antitumor, 16, 17 and antiviral 18 activity. It should be noted that derivatives of cyclic ureas are active inhibitors of enzymes: secretase (BASE1) 19, 20 and HIV 1 protease.…”