InChI=1S/C18H18N4O4/c1-21-16-14(4-3-9-19-16)22(18(25)17(21)24)11-15(23)20-10-12-5-7-13(26-2)8-6-12/h3-9H,10-11H2,1-2H3,(H,20,23)