InChI=1S/C24H28N2O7/c1-32-20-14-16(5-8-18(20)27)6-9-22(29)25-11-3-4-12-26-23(30)10-7-17-13-19(28)24(31)21(15-17)33-2/h5-10,13-15,27-28,31H,3-4,11-12H2,1-2H3,(H,25,29)(H,26,30)/b9-6?,10-7+