InChI=1/C21H22O10/c1-29-14-5-4-10(2-3-11-6-12(22)9-13(23)7-11)8-15(14)30-21-18(26)16(24)17(25)19(31-21)20(27)28/h2-9,16-19,21-26H,1H3,(H,27,28)/b3-2+