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A new homochiral ligand,(R)-2-(4-pyridyl)-4,5-dihydrothiazole-4-carboxylic acid(HL~R), has been synthesized. Two complexes, [ZnL_2~R(H_2O)_2]?H_2O(1) and [MnL_2~R(H_2O)_2]?H_2O(2) have been prepared by the reactions of Zn(Ⅱ) and Mn(Ⅱ) ions with the ligand