5H-[1]benzopyrano[4,3-b]pyridine-3-carboxylic acid, 2-(ethylamino)-5-oxo-, ethyl ester InChI=1/C17H16N2O4/c1-3-18-15-12(16(20)22-4-2)9-11-14(19-15)10-7-5-6-8-13(10)23-17(11)21/h5-9H,3-4H2,1-2H3,(H,18,19 ethyl 2-(ethylamino)-5-oxo-5H-chromeno[4,3-b]pyridine-3-carboxylate