Ammonium → 1-(tert-Butyl) 2-methyl 4-methylenepyrrolidine-1,2-dicarboxylate

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[Br-:25].[CH3:20][CH2:21][O:22][CH2:23][CH3:24].[CH3:26][P+:27]([c:28]1[cH:29][cH:30][cH:31][cH:32][cH:33]1)([c:34]1[cH:35][cH:36][cH:37][cH:38][cH:39]1)[c:40]1[cH:41][cH:42][cH:43][cH:44][cH:45]1.[Cl-:18].[NH4+:19].[O:1]=[C:2]1[CH2:3][CH:4]([C:14](=[O:15])[O:16][CH3:17])[N:5]([C:7](=[O:8])[O:9][C:10]([CH3:11])([CH3:12])[CH3:13])[CH2:6]1>>[C:2]1(=[CH2:20])[CH2:3][CH:4]([C:14](=[O:15])[O:16][CH3:17])[N:5]([C:7](=[O:8])[O:9][C:10]([CH3:11])([CH3:12])[CH3:13])[CH2:6]1