Synthesis of thieno[2,3-b][1,6]naphthyridines and pyrimido[4`,5`: 4,5]thieno[2,3-b][1,6]naphthyridines Research Authors 2- Fatma k. Abdel-Wadood, Maisa I. Abdel-Monem, Atiat M. Fahmy, and Ahmed A. Geies Research Journal Journal of Chemical Research Research Pages 5 Research Rank 1 Research Vol 5 Research Year 2008