[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C@H:8]([N:12]1[CH2:17][CH2:16][C:15]2[S:18][CH:19]=[CH:20][C:14]=2[CH2:13]1)[C:9]([OH:11])=[O:10].CC(C)=O.Cl>CO>[ClH:1].[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C@H:8]([N:12]1[CH2:17][CH2:16][C:15]2[S:18][CH:19]=[CH:20][C:14]=2[CH2:13]1)[C:9]([OH:11])=[O:10]61 g of (S)-(+)-α-(2-chlorophenyl)-6,7-dihydro-4H-thieno[3,2-c]pyridine-5-acetic acid obtained in Example 5 was added to a mixture of 300 ml of acetone and 15 ml of methanol, and then heated to 40° C. 16.4 ml of concentrated hydrochloric acid was added thereto, and the resulting mixture was stirred at room temperature for 2 hrs, and then, at below 5° C. for at least 2 hrs. The precipitated crystals were filtered, washed with 100 ml of acetone and dried at 40° C. under a reduced pressure, to obtain 61 g of the title compound as a white-yellow solid (yield: 90%).
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