[F:1][C:2]1[CH:3]=[CH:4][C:5]([O:27][CH3:28])=[C:6]([C:8]2[C:9]3[CH:16]=[C:15]([I:17])[N:14](S(C4C=CC=CC=4)(=O)=O)[C:10]=3[N:11]=[CH:12][N:13]=2)[CH:7]=1.[OH-].[Na+]>O1CCOCC1.O>[F:1][C:2]1[CH:3]=[CH:4][C:5]([O:27][CH3:28])=[C:6]([C:8]2[C:9]3[CH:16]=[C:15]([I:17])[NH:14][C:10]=3[N:11]=[CH:12][N:13]=2)[CH:7]=1A solution of Example 3C (3.5 g, 6.78 mmol) in 70 mL dioxane was treated with aqueous sodium hydroxide (11.30 mL, 67.8 mmol, 6 M) and stirred at 100° C. for 1 hour. The reaction mixture was cooled and diluted with 300 mL of water. The aqueous mixture was extracted with ethyl acetate (3×), and the combined organic fractions were washed with brine, dried over magnesium sulfate and concentrated to give the title compound. MS (ESI+) m/z 370.1 (M+H)+.
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