InChI=1S/C21H19N3O4/c1-11-15(4-3-5-18(11)25)20(26)24-17-10-14(21(27)28-2)8-12-6-7-13(19(22)23)9-16(12)17/h3-10,25H,1-2H3,(H3,22,23)(H,24,26)