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