[CH2:1]1[C:6]2([C:16](=O)[NH:15][C:14](=O)[C:8]3([CH2:13]CCC[CH2:9]3)[NH:7]2)[CH2:5]CCC1.CC1(C)C(=O)NC(=O)C(C)(C)N1>>[CH3:5][C:6]1([CH3:1])[CH2:16][NH:15][CH2:14][C:8]([CH3:13])([CH3:9])[NH:7]1By following the above procedure, and substituting for 7,15-diazadispiro[5,1,5,3]hexadecane14,16-dione an equivalent amount of 2,2,6,6-tetramethyl-3,5-diketopiperazine, there is obtained 2,2,6,6-tetramethylpiperazine.
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