C[O:2][C:3](=[O:24])[C:4]1[CH:9]=[CH:8][C:7]([NH:10][S:11]([C:14]2[CH:19]=[CH:18][C:17]([S:20]([CH3:23])(=[O:22])=[O:21])=[CH:16][CH:15]=2)(=[O:13])=[O:12])=[CH:6][CH:5]=1.CO.[OH-].[Na+]>O1CCCC1>[CH3:23][S:20]([C:17]1[CH:16]=[CH:15][C:14]([S:11]([NH:10][C:7]2[CH:8]=[CH:9][C:4]([C:3]([OH:24])=[O:2])=[CH:5][CH:6]=2)(=[O:13])=[O:12])=[CH:19][CH:18]=1)(=[O:21])=[O:22]To a stirring solution of 4-(4-methanesulfonyl-benzenesulfonylamino)-benzoic acid methyl ester (0.456 g, 1.26 mmol) in a mixture of tetrahydrofuran (10 mL)/methanol (10 mL) is added 2N sodium hydroxide (2 ml, 4.0 mmol) and the reaction is heated to reflux for 1 hour. The reaction is then concentrated to dryness and the residue is dissolved in 95% dichloromethane/5% isopropanol and washed with 0.1N HCl. The organic layer is separated and dried over anhydrous sodium sulfate, filtered, and concentrated to provide 0.403 g (90%) of the pure title compound. MS (ES−) m/e 354.0 (M−1)−.
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