InChI=1S/C21H30O9/c1-4-10-13(23)5-12-9(3)14(6-11(15(10)12)8(2)7-22)29-21-18(26)16(24)17(25)19(30-21)20(27)28/h4,8,11-12,14-19,21-22,24-26H,3,5-7H2,1-2H3,(H,27,28)/b10-4+