InChI=1S/C20H20O13S/c21-7-13-15(25)19(33-34(27,28)29)20(31-13)32-18-16(26)14-11(24)5-10(23)6-12(14)30-17(18)8-2-1-3-9(22)4-8/h1-6,13,15,17-25H,7H2,(H,27,28,29)