To a stirred mixture of 4-acetylamino-5-chloro-2-ethoxybenzoic acid (2.0 g), 2-aminomethyl-4-(4-fluorobenzyl)morpholine (1.6 g), and dichloromethane (20 ml) is added 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (1.5 g), and the resulting mixture is stirred at 25° C. for 1.5 hours. The reaction mixture is washed successively with water, aqueous sodium hydroxide solution and saturated aqueous sodium chloride solution, dried over magnesium sulfate, and evaporated. The residue is recrystallized from ethanol to give the title compound (2.1 g), mp 161°-163° C.
