Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of bioactive molecules and drug candidates requiring stereochemical control. It features a piperazine core with N1 and N4 protected by tert-butoxycarbonyl (Boc) groups and a free aminomethyl side chain at the (S)-2 position, making it valuable in medicinal chemistry for constructing peptidomimetics and kinase inhibitors. Commonly employed in solid-phase and solution-phase peptide synthesis due to the orthogonal protecting groups that allow selective deprotection and coupling. Also utilized in the preparation of protease inhibitors and GPCR-targeted compounds where the piperazine scaffold enhances solubility and binding affinity.