[OH-].[K+].[N+:3]([C:6]1[CH:7]=[C:8]2[C:12](=[CH:13][CH:14]=1)[N:11]([CH2:15][CH2:16][CH3:17])[C:10]([C:18]([O:20]CC)=[O:19])=[CH:9]2)([O-:5])=[O:4].O.Cl>CS(C)=O>[N+:3]([C:6]1[CH:7]=[C:8]2[C:12](=[CH:13][CH:14]=1)[N:11]([CH2:15][CH2:16][CH3:17])[C:10]([C:18]([OH:20])=[O:19])=[CH:9]2)([O-:5])=[O:4]236 mg (3.68 mmol, 85% pure) of potassium hydroxide (powder) are initially charged in 10 ml of dimethyl sulphoxide, 961 mg (3.48 mmol) of the compound from Example I are added and the mixture is stirred at RT for half an hour. The reaction mixture is poured into about 100 ml of water and with cooling, 10% strength hydrochloric acid is added a little at a time to the solution until no more precipitate is formed. The precipitated solid is filtered off with suction and dried in a desiccator under reduced pressure overnight.
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