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