InChI=1S/C21H18O16S/c22-7-4-9(24)14(25)18-13(7)8(23)5-11(34-18)6-1-2-10(12(3-6)37-38(31,32)33)35-21-17(28)15(26)16(27)19(36-21)20(29)30/h1-5,15-17,19,21-22,24-28H,(H,29,30)(H,31,32,33)