Used in peptide synthesis as a building block for creating specific peptide sequences, particularly in the development of pharmaceuticals and bioactive compounds. It serves as a protective group for threonine, ensuring selective reactions during peptide chain assembly. Also employed in research for studying enzyme mechanisms and protein interactions due to its ability to mimic natural amino acids. Its hydrazide group makes it useful in conjugation reactions, often applied in labeling or modifying biomolecules for analytical or therapeutic purposes.