InChI=1S/C9H12N6O4S/c1-4(16)13-5(9(18)19)2-20-15-14-8-6(7(10)17)11-3-12-8/h3,5,15H,2H2,1H3,(H2,10,17)(H,13,16)(H,18,19)/b14-8-