Under the conditions of Example 2(a), 3.29 g (10.93 mmol) of 2-[N-(4-fluoro-2-trifluoromethylphenyl)sulfamoyl]acetic acid, 1.70 g (10.93 mmol) L-serine methyl ester hydrochloride, 1.67 g (10.93 mmol) of hydroxybenzotriazole, hydrate, as well as 1.11 g (10.93 mmol) of triethylamine and 2.26 g (10.93 mmol) of dicyclohexylcarbodiimide are reacted and worked up analogously. The crude product is chromatographed on silica gel. The title compound is eluted with ethanol and crystallized upon concentration.
