C[O:2][C:3]([CH:5]1[CH2:9][N:8]([CH:10]2[CH2:15][C:14]([CH3:17])([CH3:16])[NH:13][C:12]([CH3:19])([CH3:18])[CH2:11]2)[C:7](=[O:20])[CH2:6]1)=O.O.[NH2:22][NH2:23].NC1CC(C)(C)NC(C)(C)C1.C(OC)(=O)C(CC(OC)=O)=C>CO>[NH:22]([C:3]([CH:5]1[CH2:9][N:8]([CH:10]2[CH2:15][C:14]([CH3:17])([CH3:16])[NH:13][C:12]([CH3:19])([CH3:18])[CH2:11]2)[C:7](=[O:20])[CH2:6]1)=[O:2])[NH2:23]4-Hydrazinocarbonyl-1-(2,2,6,6-tetramethyl-4-piperidinyl)-2-pyrrolidone was prepared by the hydrazinolysis of 4-(methoxycarbonyl)-1-(2,2,6,6-tetramethyl-4-piperidinyl)-2-pyrrolidone with excess hydrazine hydrate in methanol. The above intermediate half ester was prepared by the addition of 4-amino-2,2,6,6-tetramethylpiperidine to dimethyl itaconate according to the procedure described in U.S. Pat. No. 4,309,546.
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