InChI=1S/C20H20O14S/c21-9-3-1-8(5-11(9)23)2-4-10(22)15-12(24)6-13(25)18(17(15)28)33-20-19(34-35(29,30)31)16(27)14(26)7-32-20/h1-6,14,16,19-21,23-28H,7H2,(H,29,30,31)