Used primarily as a research compound in neuroscience and pharmacology, particularly in studies related to opioid receptors. It serves as a key building block in the synthesis of opioid peptides and receptor probes, helping scientists investigate pain modulation, addiction mechanisms, and receptor selectivity. Due to its modified structure, it enhances metabolic stability and binding specificity in peptide-based ligands, making it valuable in developing analgesic drugs with reduced side effects. Commonly employed in structure-activity relationship (SAR) studies to optimize peptide drug candidates targeting the mu, delta, and kappa opioid receptors.