InChI=1/C20H20N4O4/c1-20(15-8-4-6-12-5-2-3-7-14(12)15)17(26)24(19(28)23-20)11-16(25)22-18(27)21-13-9-10-13/h2-8,13H,9-11H2,1H3,(H,23,28)(H2,21,22,25,27)/t20-/m1/s1/f/h21-23H	71C111AC218620DA