[CH2:1]([O:3][C:4](=[O:14])[O:5][C:6]1[CH:11]=[CH:10][C:9]([F:12])=[CH:8][C:7]=1[Cl:13])[CH3:2].[N+:15]([O-])([OH:17])=[O:16]>S(=O)(=O)(O)O>[CH2:1]([O:3][C:4](=[O:14])[O:5][C:6]1[CH:11]=[C:10]([N+:15]([O-:17])=[O:16])[C:9]([F:12])=[CH:8][C:7]=1[Cl:13])[CH3:2]A solution of the product from Example 73A (0.88 g, 4.03 mmol) in concentrated sulfuric acid (2 mL) cooled in an ice bath was added fuming nitric acid (0.27 mL, 6.45 mmol) slowly to maintain the temperature at 0° C. The mixture was stirred for an additional 2 hours, then ice water (10 mL) was added to the solution and the resultant solid was collected by filtration washed with water and dried in a vacuum oven to provide the title compound (0.87 g, 82%).
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