InChI=1S/C20H26O16S/c21-7-20(28)8-33-19(17(20)27)32-6-12-14(24)15(25)16(26)18(34-12)35-13(23)4-2-9-1-3-10(22)11(5-9)36-37(29,30)31/h1-5,12,14-19,21-22,24-28H,6-8H2,(H,29,30,31)/b4-2+