3-pyridinecarboxylic acid, 5-cyano-1,2-dihydro-6-hydroxy-4-(5-nitro-2-furanyl)-2-oxo-, ethyl ester InChI=1/C13H9N3O7/c1-2-22-13(19)10-9(6(5-14)11(17)15-12(10)18)7-3-4-8(23-7)16(20)21/h3-4H,2H2,1H3,(H2,15,17,18 ethyl 5-cyano-6-hydroxy-4-(5-nitro-2-furyl)-2-oxo-1,2-dihydropyridine-3-carboxylate