InChI=1S/C24H28N2O7/c1-31-19-13-15(5-8-17(19)27)6-10-21(29)25-11-3-4-12-26-24(30)23-22(33-23)16-7-9-18(28)20(14-16)32-2/h5-10,13-14,22-23,27-28H,3-4,11-12H2,1-2H3,(H,25,29)(H,26,30)/b10-6+