InChI=1S/C21H22O12/c1-29-11-7-10(31-14(23)8-11)4-3-9-5-12(22)18(13(6-9)30-2)32-21-17(26)15(24)16(25)19(33-21)20(27)28/h3-8,15-17,19,21-22,24-26H,1-2H3,(H,27,28)/b4-3+