InChI=1S/C21H22O10/c1-29-13-6-3-10(4-7-13)2-5-11-8-12(22)9-14(23)18(11)30-21-17(26)15(24)16(25)19(31-21)20(27)28/h2-9,15-17,19,21-26H,1H3,(H,27,28)/b5-2+