英文别名Palbociclib Impurity E; tert-butyl 4-(2-nitro-3-pyridinyl)piperazine-1-carboxylate; Palbociclib Impurity 022; tert-butyl 4-(2-nitro-3-pyridyl)piperazine-1-carboxylate; 1,1-Dimethylethyl 4-(2-nitro-3-pyridinyl)-1-piperazinecarboxylate; 1-Piperazinecarboxylic acid, 4-(2-nitro-3-pyridinyl)-, 1,1-dimethylethyl ester 
