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