5H-[1]benzopyrano[4,3-b]pyridine-3-carboxylic acid, 2-amino-5-oxo-, methyl ester InChI=1/C14H10N2O4/c1-19-13(17)9-6-8-11(16-12(9)15)7-4-2-3-5-10(7)20-14(8)18/h2-6H,1H3,(H2,15,16 methyl 2-amino-5-oxo-5H-chromeno[4,3-b]pyridine-3-carboxylate