InChI=1S/C21H24O12/c1-28-11-5-10(31-15(22)6-11)3-2-9-4-13-14(30-8-29-13)7-12(9)32-21-18(25)16(23)17(24)19(33-21)20(26)27/h2-4,7,10-11,16-19,21,23-25H,5-6,8H2,1H3,(H,26,27)/b3-2+