4-azidodipyrido[1,2-a:3',2'-d]imidazole

4-hydroxydipyrido[1,2-a:3',2'-d]imidazole

4-hydroxyimidazo[1,2-a:5,4-b']dipyridine-3-carboxylic acid

3-carbethoxy-4-hydroxydipyrido[1,2-a,3',2'-d]imidazole

ethyl N-(imidazo[1,2-a]pyridin-3-yl)aminomethylenemalonate