: tert-Butyl 4-carbamoylpiperidine-1-carboxylate, 1-Boc-4-piperidinecarboxamide, tert-Butyl 4-Carbamoyl-1-piperidinecarboxylate, 1-(tert-Butoxycarbonyl)-4-piperidinecarboxamide, 4-Carbamoyl-1-piperidinecarboxylic acid tert-Butyl ester