InChI=1S/C21H22O13/c1-29-8-4-2-7-3-5-9(22)31-14(7)10(8)15-17-21(34-17,20(28)33-15)6-30-19-13(25)11(23)12(24)16(32-19)18(26)27/h2-5,11-13,15-17,19-20,23-25,28H,6H2,1H3,(H,26,27)