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