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