InChI=1S/C23H24N2O4/c1-14(2)7-8-16-11-17(27)12-20-21(16)24-22-18(23(28)29)5-4-6-19(22)25(20)10-9-15(3)13-26/h4-7,9,11-12,26H,8,10,13H2,1-3H3,(H,28,29)/b15-9+