InChI=1S/C20H20O13S/c21-9-3-1-2-8(4-9)12-5-10(22)15-13(31-12)6-11(23)19(17(15)25)32-20-18(26)16(24)14(7-30-20)33-34(27,28)29/h1-4,6,12,14,16,18,20-21,23-26H,5,7H2,(H,27,28,29)