This compound is the hydrochloride salt of the dipeptide L-histidyl-L-arginine, a specialty chemical used primarily in biochemical and peptide research. It serves as a model substrate for studying the activity of trypsin-like serine proteases due to the C-terminal arginine residue, which mimics natural cleavage sites. Applications include enzyme kinetics assays, investigations of peptide transport and metabolism, and as a building block in the synthesis of larger bioactive peptides. It is valuable in academic research for understanding protease mechanisms and in pharmaceutical development for potential therapeutic peptides targeting proteolytic pathways in diseases like cancer and inflammation.