InChI=1/C21H16N4O4S/c1-2-13-3-5-15(6-4-13)23-20-17(19(26)24-21-22-9-10-30-21)12-14-11-16(25(27)28)7-8-18(14)29-20/h3-12H,2H2,1H3,(H,22,24,26)/p+1/b23-20-/fC21H17N4O4S/h23-24H/q+1 51D6F1E11B1CE98D