InChI=1S/C23H34O9/c1-3-5-6-7-8-12-15-20(30-15)16(13-10-9-11-14(24)4-2)31-23-19(27)17(25)18(26)21(32-23)22(28)29/h4,9,11,14-21,23-27H,2-3,5-8,12H2,1H3,(H,28,29)/b11-9+