InChI=1S/C20H20O17S/c21-9-1-7(2-10(22)14(9)25)17(27)34-5-13-16(26)20(30,19(29)36-13)6-35-18(28)8-3-11(23)15(12(24)4-8)37-38(31,32)33/h1-4,13,16,19,21-26,29-30H,5-6H2,(H,31,32,33)