Nandha Kumar, R. et al. 2010. Synthesis and Antibacterial Activities of 1,2,3,4,6,7,8,9,10-Nonahydro-1,3,7,9,10-Pentaphenyl- 5-(2-Furanyl)-2,8-Dithio-4,6-Dioxo-5H-Pyrido [2,3-d; 6,5-d´ ] Dipyrimidine . Asian Journal of Chemistry. 15, 3 (Mar. 2010), 1447–1451.