InChI=1S/C25H28O8/c26-18(13-11-16-7-3-1-4-8-16)15-19(14-12-17-9-5-2-6-10-17)32-25-22(29)20(27)21(28)23(33-25)24(30)31/h1-10,12,14,19-23,25,27-29H,11,13,15H2,(H,30,31)/b14-12+