InChI=1S/C20H20O10S/c1-10(8-30-31(26,27)28)2-3-13-15(22)5-4-12(19(13)24)14-9-29-17-7-11(21)6-16(23)18(17)20(14)25/h2,4-7,14,21-24H,3,8-9H2,1H3,(H,26,27,28)/b10-2+