InChI=1S/C21H19ClO11S/c1-8(7-31-34(28,29)30)4-5-11-9(2)18-13(6-12(11)23)32-19-14(21(27)33-18)10(3)16(22)17(24)15(19)20(25)26/h4,6,23-24H,5,7H2,1-3H3,(H,25,26)(H,28,29,30)/b8-4+