InChI=1/C20H18N4O4/c21-20(23-28-14-15-4-1-7-18(10-15)24(25)26)17-6-2-8-19(11-17)27-13-16-5-3-9-22-12-16/h1-12H,13-14H2,(H2,21,23)/f/h21H2/b23-20+ DCC41650E80BF075