InChI=1/C12H10N4O4S/c17-9-4-16(12(20)14-9)15-11(19)6-1-2-8-7(3-6)13-10(18)5-21-8/h1-3H,4-5H2,(H,13,18)(H,15,19)(H,14,17,20)/p-1/fC12H9N4O4S/h13,15H/q-1 12B09B58B524E0F4