Used in peptide synthesis as a building block to introduce specific modifications into peptide chains. It is particularly useful in creating analogs of biologically active peptides, enhancing their stability, binding affinity, or therapeutic properties. Applied in research to study cysteine-containing peptides and their interactions with proteins or enzymes. Also utilized in drug development to design peptide-based drugs with improved pharmacokinetics or targeted delivery. Its unique structure allows for the exploration of novel peptide architectures in medicinal chemistry and biochemistry.