InChI=1S/C24H28O9/c1-3-15(16(4-2)17-10-7-13(25)11-18(17)26)12-5-8-14(9-6-12)32-24-21(29)19(27)20(28)22(33-24)23(30)31/h5-11,19-22,24-29H,3-4H2,1-2H3,(H,30,31)/b16-15-