InChI=1S/C21H32O9/c1-9(2)12-8-13(22)10(3)6-5-7-11(4)18(14(12)23)29-21-17(26)15(24)16(25)19(30-21)20(27)28/h7,9-10,12,15-19,21,24-26H,5-6,8H2,1-4H3,(H,27,28)/b11-7-