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