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