Cl[S:2]([C:5]1[CH:6]=[C:7]([CH:11]=[CH:12][CH:13]=1)[C:8]([OH:10])=[O:9])(=[O:4])=[O:3].[CH2:14]([NH2:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1>C(Cl)Cl>[CH2:14]([NH:21][S:2]([C:5]1[CH:6]=[C:7]([CH:11]=[CH:12][CH:13]=1)[C:8]([OH:10])=[O:9])(=[O:4])=[O:3])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=13-Chlorosulfonyl-benzoic acid (300 mg, 1.36 mmol), and benzylamine (0.60 mL, 5.49 mmol) were stirred at room temperature in anhydrous CH2Cl2 (10 mL) overnight under N2. The reaction mixture was concentrated in vacuo. Purification of the residue on IR-120 ion exchange resin column (elution with methanol) afforded the title compound (395 mg, 100%) as a white solid.
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