InChI=1S/C21H20O13S/c22-7-14-19(34-35(29,30)31)17(27)18(28)21(33-14)16-11(25)5-10(24)15-12(26)6-13(32-20(15)16)8-2-1-3-9(23)4-8/h1-6,14,17-19,21-25,27-28H,7H2,(H,29,30,31)