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