InChI=1S/C21H30O9/c1-5-9-13-10(7(2)3)6-11(8(4)12(13)15(23)14(9)22)29-21-18(26)16(24)17(25)19(30-21)20(27)28/h5,7,10-13,15-19,21,23-26H,4,6H2,1-3H3,(H,27,28)/b9-5-