Used primarily as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other biologically active molecules. Its hydrazine functionality allows for coupling reactions with carbonyl compounds, enabling the formation of hydrazones, which are valuable in medicinal chemistry for building heterocyclic structures. Also employed in the preparation of labeled compounds for biochemical assays and imaging agents due to the presence of the iodine atom, which can be used in radiolabeling (e.g., I-125). Additionally, it serves as a building block in the synthesis of selective serotonin reuptake inhibitors (SSRIs) and other neuroactive drugs. Its hydrochloride salt form enhances stability and solubility, facilitating use in aqueous reaction systems.