[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[C:4]([CH3:9])[CH:3]=1.[N+:10]([C:13]1[CH:21]=[CH:20][C:16]([C:17](O)=[O:18])=[CH:15][CH:14]=1)([O-:12])=[O:11]>>[N+:10]([C:13]1[CH:14]=[CH:15][C:16]([C:17]([NH:1][C:2]2[CH:7]=[CH:6][C:5]([CH3:8])=[C:4]([CH3:9])[CH:3]=2)=[O:18])=[CH:20][CH:21]=1)([O-:12])=[O:11]Using 3,4-xylidine (1.35 g, 11.0 mmol) and 4-nitrobenzoic acid (1.69 g, 10.0 mmol), the procedure of Reference Example 16 was repeated to obtain 2.70 g (quantitative) of the title compound in the form of light yellow crystals.
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