“…(11), probe 4 (12), probe 5 (13), probe 8 (14), probe 9 Pteridines are a class of bicyclic planar compounds, (15), probe 11 (16), probe 12 (17), probe 13 and 14 (18), some of which are highly fluorescent and structurally probe 15 (19), probe 16 (15)). Synthesis of probes 6, 7, similar to purines.…”