InChI=1S/C18H20N4O4/c1-4-26-18-13(10-19)14(20)9-16(22-18)21-17(23)8-11-7-12(24-2)5-6-15(11)25-3/h5-7,9H,4,8H2,1-3H3,(H3,20,21,22,23)