Used in peptide synthesis and bioconjugation, this compound enables site-specific modification of proteins and peptides. The norbornene group allows for efficient labeling via tetrazine ligation, a bioorthogonal reaction useful in live-cell imaging and targeted drug delivery. Its lysine backbone provides a natural amino acid handle for incorporation into peptides, making it valuable in developing antibody-drug conjugates and diagnostic probes. The hydrochloride form ensures stability and solubility in aqueous reaction systems.