InChI=1S/C22H26N4O4/c1-26(2)22(30)18(14-16-8-4-3-5-9-16)25-21(29)19(27)15-20(28)24-13-11-17-10-6-7-12-23-17/h3-10,12,18H,11,13-15H2,1-2H3,(H,24,28)(H,25,29)/t18-/m0/s1