InChI=1S/C20H26N2O7/c1-9(2)6-12(22-19(26)17(25)18-11(21)8-15(24)29-18)14-7-10-4-3-5-13(23)16(10)20(27)28-14/h3-5,9,11-12,14,17-18,23,25H,6-8,21H2,1-2H3,(H,22,26)