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