[OH-].[K+:2].[Cl:3][C:4]1[C:8]([Cl:9])=[C:7]([C:10]([OH:12])=[O:11])[S:6][N:5]=1>O.C(O)C>[Cl:3][C:4]1[C:8]([Cl:9])=[C:7]([C:10]([O-:12])=[O:11])[S:6][N:5]=1.[K+:2]Potassium hydroxide (0.27 g) dissolved in 3 ml of water was added to a solution of 3,4-dichloroisothiazole-5-carboxylic acid (0.95 g) in 4 ml of ethanol. The solvent was distilled off under reduced pressure. The crystals thus obtained were washed with a small quantity of ethanol.
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