InChI=1S/C21H20O13/c22-8-4-11(24)14(12(25)5-8)15(27)13(26)3-7-1-2-9(6-10(7)23)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)