InChI=1S/C22H20N2O14S2/c25-13-8-12-9(7-15(13)40(34,35)36)1-6-14(37-22-19(28)17(26)18(27)20(38-22)21(29)30)16(12)24-23-10-2-4-11(5-3-10)39(31,32)33/h1-8,17-20,22,25-28H,(H,29,30)(H,31,32,33)(H,34,35,36)/b24-23+