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