InChI=1S/C14H16N4O4/c15-9(14(21)22)5-8-6-10(12(20)7-11(8)19)17-18-13-3-1-2-4-16-13/h1-4,6-9,17,20H,5,15H2,(H,16,18)(H,21,22)/t8-,9+/m1/s1