InChI=1S/C21H22O10/c1-29-12-6-4-10(5-7-12)2-3-11-8-13(22)15(23)14(9-11)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+