InChI=1S/C22H24O9/c1-29-18-13(9-5-8-12-6-3-2-4-7-12)10-11-14(23)19(18)30-22-17(26)15(24)16(25)20(31-22)21(27)28/h2-8,10-11,15-17,20,22-26H,9H2,1H3,(H,27,28)/b8-5+