[CH2:1]([NH:5][C:6]1[CH:10]=[C:9]([C:11]2[CH:16]=[CH:15][N:14]=[CH:13][CH:12]=2)[S:8][C:7]=1[C:17]([OH:19])=O)[CH2:2][CH2:3][CH3:4].[Cl-].[NH4+].C([N:24](CC)CC)C.ON1C2C=CC=CC=2N=N1.Cl.C(N=C=NCCCN(C)C)C.C(=O)([O-])O.[Na+]>O.CN(C=O)C>[CH2:1]([NH:5][C:6]1[CH:10]=[C:9]([C:11]2[CH:16]=[CH:15][N:14]=[CH:13][CH:12]=2)[S:8][C:7]=1[C:17]([NH2:24])=[O:19])[CH2:2][CH2:3][CH3:4]A mixture of 3-(butylamino)-5-(pyridin-4-yl)thiophene-2-carboxylic acid (0.370 g, 1.34 mmol), ammonium chloride (0.717 g, 13.4 mmol), triethylamine (1.88 mL, 13.4 mmol) and DMF (8.0 mL) was stirred for 5 min. Then, 1-hydroxybenzotriazole (0.541 g, 4.00 mmol) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.767 g, 4.00 mmol) were added and stirring was continued for 3 days. The mixture was then poured into sat. aqueous sodium hydrogen carbonate (100 mL) and water (60 mL). Extraction with ethyl acetate-tetrahydrofuran (3:1, 2×100 mL), washing with sat. aqueous sodium hydrogen carbonate and brine, drying over magnesium sulfate, filtration and concentration at reduced pressure gave a yellow solid. This solid was triturated with dichloromethane, and the precipitate was collected by filtration to afford the title compound (0.202 g, 55%) as a yellow solid. The filtrate was purified by column chromatography (Combiflash, 12 g silica gel, dichloromethane to ethyl acetate) to afford the additional title compound (0.067 g, 18%):
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