InChI=1S/C21H26N2O9/c1-8(2)21(4)20(30)22-16(23-21)11-7-9(3)5-6-10(11)18(29)32-19-14(26)12(24)13(25)15(31-19)17(27)28/h5-8,12-15,19,24-26H,1-4H3,(H,27,28)(H,22,23,30)