6-Chloro-1H-imidazo[4,5-b]pyridine-2(3H)-thione
6-Chloro-1H-imidazo[4,5-c]pyridin-2(3H)-one
7-Chloro-1H-imidazo[4,5-b]pyridin-2(3H)-one
5-Chloro-1H,2H,3H-imidazo[4,5-b]pyridine-2-thione
