[Cl:1][C:2]1[CH:11]=[CH:10][C:5]([NH:6][CH:7]([CH3:9])[CH3:8])=[C:4]([N+:12]([O-])=O)[CH:3]=1.[N+:15]([O-:18])(O)=[O:16].[C:19](OC(=O)C)(=[O:21])C>C(OC(=O)C)(=O)C>[Cl:1][C:2]1[C:11]([N+:15]([O-:18])=[O:16])=[CH:10][C:5]2[N:6]([CH:7]([CH3:8])[CH3:9])[C:19](=[O:21])[NH:12][C:4]=2[CH:3]=1The compound of Example 4 (1.0 g, 5.0 mmol) was suspended in acetic anhydride (10 mL) and cooled in an ice bath. To this mixture was added dropwise 1.5 mL of a 1:2 mixture of nitric acid/acetic anhydride. The reaction mixture was stirred for 5 minutes before being poured into ice-water. The solid was filtered and washed well with water and suction-dried to afford 1.01 g (80%) of the title compound as a solid.
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