(4-BOC-PIPERAZIN-1-YL)-ACETAMIDE

2-(4-BOC-PIPERAZIN-1-YL)-ACETAMIDE

(4-TERT-BUTOXYCARBONYL-PIPERAZIN-1-YL)-ACETAMIDE

tert-Butyl 4-(2-amino-2-oxoethyl)-piperazine-1-carboxylate