[OH:1][C:2]1[CH:3]=[C:4]([CH:12]=[CH:13][C:14]=1[N+:15]([O-])=O)[C:5]([CH2:7][CH2:8][C:9]([OH:11])=[O:10])=[O:6]>[OH-].[NH4+]>[NH2:15][C:14]1[CH:13]=[CH:12][C:4]([C:5]([CH2:7][CH2:8][C:9]([OH:11])=[O:10])=[O:6])=[CH:3][C:2]=1[OH:1]3-(3-Hydroxy-4-nitrobenzoyl)propionic acid in ammonium hydroxide solution was reduced with ferrous sulphate to give 3-(4-amino-3-hydroxybenzoyl)propionic acid.
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