2-(2-Aminoethylthio)benzoic acid hydrochloride is a specialty chemical intermediate used in organic synthesis and medicinal chemistry. It features a benzoic acid core connected via a thioether linkage to an ethylamine chain, providing sulfur and nitrogen functional groups ideal for building complex molecules. Commonly applied as a building block in the synthesis of pharmaceutical compounds, including enzyme inhibitors, receptor ligands, and bioactive agents targeting protein interactions. Its structure supports modifications for prodrug development and studies on biomolecular binding mechanisms involving thiols and amines.