Trans-4-(2-oxopyrrolidin-1-yl)cyclohexane-carboxylic acid (40 mg) obtained in Reference Example 2 is dissolved in chloroform (3 ml), and thereto are added thionyl chloride (15 μl) and N,N-dimethylformamide (1 drop) followed by stirring at room temperature for 15 hours. To the reaction solution are added 3-amino-N-(5-chloropyridin-2-yl)-2-naphthamide (31 mg) obtained in Example 34(1) and pyridine (1 ml), and the mixture is stirred at room temperature for 12 hours. After adding trans-4-(2-oxopyrrolidin-1-yl)cyclohexanecarboxylic acid (43 mg), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (42 mg) and 4-(dimethylamino)pyridine (56 mg), the mixture is stirred at room temperature for another 12 hours. To the reaction solution is poured saturated aqueous sodium hydrogen carbonate solution, and the mixture is extracted with chloroform. The extract is dried over sodium sulfate and evaporated to remove the solvent under reduced pressure. The resulting residue is purified by NH-silica gel column chromatography (eluent: n-hexane/ethyl acetate=1/1, then 1/4) to give title compound (36 mg).
