InChI=1S/C20H22O14S2/c21-10-16-17(22)18(23)19(24)20(32-16)31-14-7-12(8-15(9-14)34-36(28,29)30)2-1-11-3-5-13(6-4-11)33-35(25,26)27/h1-9,16-24H,10H2,(H,25,26,27)(H,28,29,30)/b2-1+