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