InChI=1S/C16H11N5O4/c1-18-13(22)9(6-17)11-7-4-2-3-5-8(7)12(19-11)10-14(23)20-16(25)21-15(10)24/h2-5,19H,1H3,(H,18,22)(H2,20,21,23,24,25)/b11-9-