[C:1]1([C:7]2[C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[NH:9][C:8]=2[C:16]([NH:18][NH2:19])=[O:17])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Br:20][C:21]1[CH:28]=[CH:27][C:24]([CH:25]=O)=[CH:23][CH:22]=1>C(O)C>[Br:20][C:21]1[CH:28]=[CH:27][C:24]([CH:25]=[N:19][NH:18][C:16]([C:8]2[NH:9][C:10]3[C:15]([C:7]=2[C:1]2[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=2)=[CH:14][CH:13]=[CH:12][CH:11]=3)=[O:17])=[CH:23][CH:22]=1A solution of Example 1C (1.76 g, 7.0 mmol) and 4-bromobenzaldehyde (1.36 g, 7.35 mmol) in ethanol (120 mL) was refluxed for 18 hours, cooled to room temperature, and filtered. The resulting solid was washed with ethanol and dried under vacuum to provide
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