InChI=1S/C21H20O13/c22-8-3-1-7(2-4-8)5-10(24)13(26)12-9(23)6-11(25)14(27)18(12)33-21-17(30)15(28)16(29)19(34-21)20(31)32/h1-4,6,15-17,19,21-23,25,27-30H,5H2,(H,31,32)