InChI=1S/C21H16O14/c22-4-1-5-9(8(2-4)34-21-17(29)15(27)16(28)18(35-21)20(32)33)13(25)10-6(11(5)23)3-7(19(30)31)12(24)14(10)26/h1-3,15-18,21-22,24,26-29H,(H,30,31)(H,32,33)