A series of novel terpyridine-skeleton molecules containing conformational rigidity, 14 containing benzo [4, 5] furo [3, 2-b] pyridine core and 15 comprising chromeno [4, 3-b] pyridine core, were synthesized, and their biological activities were evaluated. 3-(4- Phenylbenzo [4, 5] furo [3, 2-b] pyridin-2-yl) phenol (8) was determined to be a nonintercalative topo I and II dual catalytic inhibitor and 3-(4-phenylchromeno [4, 3-b] ...