[NH2:1][C:2]1[C:7]([NH2:8])=[CH:6][C:5]([N+:9]([O-:11])=[O:10])=[CH:4][N:3]=1.[CH:12](=O)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>[N+](C1C=CC=CC=1)([O-])=O>[N+:9]([C:5]1[CH:6]=[C:7]2[N:8]=[C:12]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[NH:1][C:2]2=[N:3][CH:4]=1)([O-:11])=[O:10]14.05 g 2,3-diamino-5-nitropyridine and 9.68 g benzaldehyde in 250 mL nitrobenzene were heated to 140-150° C. for 15 hours (hrs). The solvent is removed by vacuum distillation and the residue is dispersed in ethyl acetate, filtered, and the filter residue washed thoroughly with ethyl acetate.
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