“?TETRA CYCLIC HETEROAROMATIC SYSTEMS. PART-II. BENZIMIDAZO [1, 2-a] BENZIMIDAZOLES” (2000) Biological Sciences - PJSIR, 43(3), pp. 168–70. Available at: https://www.v2.pjsir.org/index.php/biological-sciences/article/view/2022 (Accessed: 10 March 2026).