InChI=1S/C25H28N2O8/c28-13-20-22(31)23(32)24(33)25(35-20)34-17-6-7-19-18(11-17)15(12-27-19)9-10-26-21(30)8-3-14-1-4-16(29)5-2-14/h1-8,11-12,20,22-25,27-29,31-33H,9-10,13H2,(H,26,30)/b8-3+