[CH:1](=O)[CH2:2][CH2:3][CH3:4].[C:6]([O:10][C:11]([N:13]1[CH2:18][CH2:17][NH:16][CH2:15][CH2:14]1)=[O:12])([CH3:9])([CH3:8])[CH3:7]>>[C:6]([O:10][C:11]([N:13]1[CH2:18][CH2:17][N:16]([CH2:1][CH2:2][CH2:3][CH3:4])[CH2:15][CH2:14]1)=[O:12])([CH3:9])([CH3:7])[CH3:8]Prepared from butanal and piperazine-1-carboxylic acid tert-butyl ester.
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