InChI=1S/C22H22O11/c1-9-13(25)8-14(32-22-19(29)17(27)18(28)20(33-22)21(30)31)15(16(9)26)12(24)7-6-10-4-2-3-5-11(10)23/h2-8,17-20,22-23,25-29H,1H3,(H,30,31)/b7-6+