InChI=1S/C21H22O13/c1-21-17(34-21)15(33-20(21)28)9-13-6(3-4-8(22)31-13)5-7(14(9)29-2)30-19-12(25)10(23)11(24)16(32-19)18(26)27/h3-5,10-12,15-17,19-20,23-25,28H,1-2H3,(H,26,27)