[Cl:1][C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][C:5]([O:11]S(C=C)(=O)=O)=[C:4]([CH3:17])[CH:3]=1.C(=O)([O-])[O-].[K+].[K+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O.C(O)C>[Cl:1][C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][C:5]([OH:11])=[C:4]([CH3:17])[CH:3]=1A solution of compound 106 (27.8 g, 100 mmol) and potassium carbonate (27.6 g, 200 mmol) in ethanol water 1/1 (600 ml) was refluxed for one hour. Citric acid (5%) was added and the mixture was extracted three times with DCM. The organic phase was dried with sodium sulphate and evaporated under reduced pressure which gave the title compound (19 g, 100%).
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