Potassium Cation → ethyl 4-(4-bromo-2,N-diformylanilino)butyrate

Reaction equation

[Br:13][CH2:14][CH2:15][CH2:16][C:17](=[O:18])[O:19][CH2:20][CH3:21].[Br:1][c:2]1[cH:3][c:4]([CH:11]=[O:12])[c:5]([NH:8][CH:9]=[O:10])[cH:6][cH:7]1.[C:22](=[O:23])([O-:24])[O-:25].[CH3:33][CH2:34][O:35][C:36](=[O:37])[CH3:38].[K+:26].[K+:27].[O:28]=[CH:29][N:30]([CH3:31])[CH3:32]>>[Br:1][c:2]1[cH:3][c:4]([CH:11]=[O:12])[c:5]([N:8]([CH:9]=[O:10])[CH2:14][CH2:15][CH2:16][C:17](=[O:18])[O:19][CH2:20][CH3:21])[cH:6][cH:7]1