InChI=1S/C23H20N2O7S/c24-13-15-1-3-16(4-2-15)14-32-19-7-5-18-12-20(8-6-17(18)11-19)33(30,31)25-21(23(28)29)9-10-22(26)27/h1-8,11-12,21,25H,9-10,14H2,(H,26,27)(H,28,29)/t21-/m1/s1