A novel larger heteroacene, 2,3,15,16-tetradecyloxy-5,8,10,13,18,21,23,26-octaaza-7,11,20,24-tetraoxohendecacene (8N8O) with two different types of heteroatoms (O and N) and eleven linearly fused rings, has been successfully synthesized and can identify iodide over other anions.