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