InChI=1S/C21H20O16S/c22-7-4-8(23)12-11(5-7)34-18(15(26)13(12)24)6-1-2-9(37-38(31,32)33)10(3-6)35-21-17(28)14(25)16(27)19(36-21)20(29)30/h1-5,14-19,21-23,25-28H,(H,29,30)(H,31,32,33)