InChI=1S/C22H24N2O7/c25-16-5-3-15(13-18(16)27)4-6-20(29)23-11-1-2-12-24-21(30)8-10-22(31)9-7-17(26)19(28)14-22/h3-10,13-14,25,27-28,31H,1-2,11-12H2,(H,23,29)(H,24,30)/b6-4?,10-8+