InChI=1S/C21H20O13/c22-7-2-1-6(3-8(7)23)11-4-9(24)13-12(5-10(25)14(26)18(13)32-11)33-21-17(29)15(27)16(28)19(34-21)20(30)31/h1-3,5,11,15-17,19,21-23,25-29H,4H2,(H,30,31)