5-Bromo-2-hydrazinylbenzoic acid hydrochloride is primarily used in organic synthesis as a building block for the preparation of more complex chemical compounds. It serves as a key intermediate in the development of pharmaceuticals, particularly in the synthesis of active pharmaceutical ingredients (APIs) that target various diseases. Its hydrazine moiety makes it valuable in the formation of hydrazone derivatives, which are often explored for their potential therapeutic properties. Additionally, this compound is utilized in research settings for the development of novel heterocyclic compounds, which are important in drug discovery and medicinal chemistry. Its applications also extend to the field of agrochemicals, where it can be used to create compounds with potential pesticidal or herbicidal activity.