[Cl:1][C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][C:11]=1[N:12]1[CH2:17][CH:16]=[CH:15][CH2:14][O:13]1)[C:5]([O:7]C)=[O:6].[OH-].[Na+].O>C(O)C>[Cl:1][C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][C:11]=1[N:12]1[CH2:17][CH:16]=[CH:15][CH2:14][O:13]1)[C:5]([OH:7])=[O:6]Prepared analogously to Example 2d from methyl 3-chloro-4-(3,6-dihydro-[1,2]oxazin-2-yl)-benzoate and sodium hydroxide in a solvent mixture of water and ethanol.
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