InChI=1S/C21H30O9/c1-8(2)11-6-13(22)9(3)12-7-14(23)10(15(11)12)4-5-29-21-18(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-