InChI=1S/C21H20N4O4/c1-4-29-21-18-17(14-6-5-12(8-22)7-15(14)28-3)16(20(23)27)11(2)25-19(18)13(10-26)9-24-21/h5-7,9,26H,4,10H2,1-3H3,(H2,23,27)