InChI=1S/C21H22O12/c1-28-13-7-14(22)31-11(5-3-9-2-4-10-12(6-9)30-8-29-10)18(13)32-21-17(25)15(23)16(24)19(33-21)20(26)27/h2-7,11,15-19,21,23-25H,8H2,1H3,(H,26,27)/b5-3+