Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of antiviral and antitumor agents. Its hydrazine functionality allows for the formation of heterocyclic structures such as pyrazoles and triazoles, which are common scaffolds in drug design. Also employed in the preparation of agrochemicals and functional materials where nitrogen-containing rings are required. The hydrochloride salt form enhances stability and solubility, making it suitable for use in aqueous or polar reaction systems.