2-(ethylamino)-5-oxo-5H-chromeno[4,3-b]pyridine-3-carbonitrile 5H-[1]benzopyrano[4,3-b]pyridine-3-carbonitrile, 2-(ethylamino)-5-oxo- InChI=1/C15H11N3O2/c1-2-17-14-9(8-16)7-11-13(18-14)10-5-3-4-6-12(10)20-15(11)19/h3-7H,2H2,1H3,(H,17,18