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