InChI=1S/C21H32O9/c1-9(2)13-12(22)8-10(3)6-5-7-11(4)14(23)18(13)29-21-17(26)15(24)16(25)19(30-21)20(27)28/h6,9,11,13,15-19,21,24-26H,5,7-8H2,1-4H3,(H,27,28)/b10-6-