PROBLEM TO BE SOLVED: To provide a compound for use in the prevention and / or treatment of an iron overload condition, for example, thalassemia and hemochromatosis. SOLUTION: A novel compound of the general formula (AI) which is a bicyclic heteroaryl, and a pharmaceutical composition containing them. [Selection diagram] None【課題】鉄過剰状態、例えば特にサラセミア及びヘモクロマトーシスの予防及び/又は治療に使用するための化合物の提供。【解決手段】二環式ヘテロアリールである一般式(A-I)の新規な化合物、それらを含む医薬組成物。【選択図】なし