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