InChI=1S/C21H22O9/c1-11(12-6-5-9-14(10-12)28-13-7-3-2-4-8-13)20(27)30-21-17(24)15(22)16(23)18(29-21)19(25)26/h2-11,15-18,21-24H,1H3,(H,25,26)/t11?,15-,16-,17+,18-,21-/m0/s1