Hydrochloric Acid → 4-Dimethylamino-2-butenoyl chloride

Reaction equation

[CH3:1][N:2]([CH2:3][CH:4]=[CH:5][C:6](=[O:7])[NH:8][c:9]1[cH:10][cH:11][cH:12][c:13]([NH:14][c:15]2[cH:16][c:17]([NH:18][c:19]3[cH:20][cH:21][cH:22][cH:23][cH:24]3)[n:25][cH:26][n:27]2)[n:28]1)[CH3:29].[CH3:30][C:31]#[N:32].[CH3:34][N:35]([C:36](=[CH:37][CH3:38])[C:39]([OH:40])=[O:41])[CH3:42].[Cl:43][C:44]([C:45]([Cl:46])=[O:47])=[O:48].[ClH:33].[O:49]=[CH:50][N:51]([CH3:52])[CH3:53]>>[CH3:1][N:2]([CH2:3][CH:4]=[CH:5][C:6](=[O:7])[Cl:43])[CH3:29]