InChI=1/C12H11N4O4S/c1-13-11-6-7-14-8-12(11)21(19,20)15-9-2-4-10(5-3-9)16(17)18/h2-8H,1H3,(H,13,14)/q-1/p+1/fC12H12N4O4S/h13-14H/q B27BD16ACE061E0F