InChI=1/C22H20N4O4S/c1-15-12-13-17(26(27)28)14-20(15)31(29,30)24-21(16-8-4-3-5-9-16)22-23-18-10-6-7-11-19(18)25(22)2/h3-14,21,24H,1-2H3/t21-/m1/s1 4DE71E92E987FBEC