[C:1]([NH:4][C:5]1[CH:6]=[C:7]([S:11]([OH:14])(=[O:13])=[O:12])[CH:8]=[CH:9][CH:10]=1)(=[O:3])[CH3:2].[OH-].[Na+:16]>O>[C:1]([NH:4][C:5]1[CH:6]=[C:7]([S:11]([O-:14])(=[O:12])=[O:13])[CH:8]=[CH:9][CH:10]=1)(=[O:3])[CH3:2].[Na+:16]A solution of 118.6 mg (0.55 mmol) of 3-acetamidobenzenesulfonic acid in 0.5 mL of water was treated with 0.55 mL (0.55 mmol) of 1.0N NaOH at 0° C. After stirring at room temperature for 4 hours, the mixture was concentrated to dryness and used without subsequent purification.
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