C[O:2][C:3]([C@@H:5]1[CH2:9][C@@H:8]([N:10]([CH3:12])[CH3:11])[CH2:7][NH:6]1)=O.[NH3:13]>CO>[CH3:11][N:10]([CH3:12])[C@H:8]1[CH2:7][NH:6][C@H:5]([C:3]([NH2:13])=[O:2])[CH2:9]1A solution of (2S,4R)-4-Dimethylamino-pyrrolidine-2-carboxylic acid methyl ester (225 mg) and 7M ammonia in methanol (7 ml) is stood for 18 hours at room temperature in a sealed vessel. Evaporation and trituration with diethyl ether gives the title compound as a white solid.
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