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