Used as an amine protecting group (Boc-protected secondary amine) in the synthesis of pharmaceutical and fine chemical compounds. The tert-butoxycarbonyl (Boc) moiety offers stability under basic and neutral conditions, with selective deprotection under mild acidic conditions, enabling precise control in multi-step syntheses involving nitrogen-containing structures such as peptides or heterocycles. The unique 1-(hydroxymethyl)cyclopropyl substituent allows for further functionalization, making it suitable for building complex bioactive molecules with enhanced selectivity and yield.