InChI=1S/C18H18N4O4/c1-10(23)17-20-21-18(25-17)12-7-13(8-12)19-16(24)15-9-14(22-26-15)11-5-3-2-4-6-11/h2-6,9-10,12-13,23H,7-8H2,1H3,(H,19,24)/t10-,12-,13-/m1/s1