InChI=1S/C22H26N2O7/c25-16-6-3-14(11-19(16)28)4-8-21(30)23-9-1-2-10-24-22(31)13-18(27)15-5-7-17(26)20(29)12-15/h3-8,11-12,18,25-29H,1-2,9-10,13H2,(H,23,30)(H,24,31)/b8-4+