InChI=1S/C26H34N2O4/c1-3-5-21-7-11-23(12-8-21)31-19-25(29)27-15-17-28(18-16-27)26(30)20-32-24-13-9-22(6-4-2)10-14-24/h7-14H,3-6,15-20H2,1-2H3