InChI=1S/C21H22O13/c1-6(8-4-10(23)11(24)5-9(8)22)15(27)14-12(25)2-7(3-13(14)26)33-21-18(30)16(28)17(29)19(34-21)20(31)32/h2-6,16-19,21-26,28-30H,1H3,(H,31,32)