[Cl:1][C:2]1[N:7]=[C:6](Cl)[C:5]([F:9])=[C:4]([CH2:10][CH3:11])[N:3]=1.[OH-:12].[Na+]>O>[NH4+:3].[Cl:1][C:2]1[N:7]=[C:6]([OH:12])[C:5]([F:9])=[C:4]([CH2:10][CH3:11])[N:3]=1A mixture of the compound of part (ii) (40 kg) and water (10 kg) was heated to 90° C. and 4N aqueous sodium hydroxide solution (127 L) added.
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