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