InChI=1S/C20H22O9/c1-20(2,29-19-17(25)16(24)15(23)12(8-21)27-19)13-7-10-11(26-13)5-3-9-4-6-14(22)28-18(9)10/h3-7,12,15-17,19,21,23-25H,8H2,1-2H3