InChI=1S/C20H20O14S/c21-8-4-10(23)14-13(5-8)32-18(7-1-2-9(22)12(3-7)34-35(28,29)30)19(16(14)26)33-20-17(27)15(25)11(24)6-31-20/h1-5,11,15,17-25,27H,6H2,(H,28,29,30)