Hydroxybenzenesulfonic acid → 3-[4-({[4'-(2-Ethoxyethoxy)-2',6'-dimethylbiphenyl-3-yl]methyl}amino)-2-fluorophenyl]propanoic acid benzenesulfonate

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To a solution of 3-[4-({[4′-(2-ethoxyethoxy)-2′,6′-dimethylbiphenyl-3-yl]methyl}amino)-2-fluorophenyl]propanoic acid (0.372 g, 0.800 mmol) in diethyl ether (5 mL) was added a solution of benzenesulfonic acid monohydrate (0.141 g, 0.800 mmol) in ethyl acetate (3 mL), and the resulting crystals were washed with ethyl acetate-diethyl ether to give the title compound as colorless crystals (0.474 g, yield 95%).

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