InChI=1S/C23H26N4O4/c1-14(26-22(29)18(24)11-15-7-3-2-4-8-15)21(28)27-20(23(30)31)12-16-13-25-19-10-6-5-9-17(16)19/h2-10,13-14,18,20,25H,11-12,24H2,1H3,(H,26,29)(H,27,28)(H,30,31)/t14-,18-,20+/m1/s1