In previous papers, we have described the discovery of a new series of compounds, 4, 5, 6, 7-tetrahydro-5-methylimidazo [4, 5, l~~ l [l, 4lbenzodiazepin-2 (~-ones, TlBO (1 and la), with potent anti-HW-1 activity and the synthesis of analogues to better define the structure-activity relationships (SAR) in terms of changes in substituents at the N-6 position and variations of the five-membered urea ring as well as the seven-membered diazepine ring. This paper ...