[C:1]([C:5]1[CH:10]=[CH:9][C:8]([CH2:11][CH2:12][CH2:13][CH:14]=[O:15])=[CH:7][CH:6]=1)([O:3][CH3:4])=[O:2].[Br:16]Br>>[Br:16][CH:13]([CH2:12][CH2:11][C:8]1[CH:9]=[CH:10][C:5]([C:1]([O:3][CH3:4])=[O:2])=[CH:6][CH:7]=1)[CH:14]=[O:15]performing a bromiantion reaction between 4-(4-carbomethoxyphenyl)butanal and Br2 to give 2-bromo-4-(4-carbomethoxyphenyl)butanal;
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