InChI=1S/C28H30N4O4/c33-27-7-4-12-32(27)13-16-36-26-9-8-24-18-23(26)20-35-15-2-1-14-34-19-21-5-3-6-22(17-21)25-10-11-29-28(30-24)31-25/h1-3,5-6,8-11,17-18H,4,7,12-16,19-20H2,(H,29,30,31)/b2-1+