InChI=1S/C22H24O9/c1-29-16-11-14(23)8-7-13(16)4-2-3-12-5-9-15(10-6-12)30-22-19(26)17(24)18(25)20(31-22)21(27)28/h2-3,5-11,17-20,22-26H,4H2,1H3,(H,27,28)/b3-2+