Used in peptide synthesis as a protected lysine derivative, enabling selective modification of proteins and bioconjugation. The nicotinoyl group provides a photolabile or chemically labile handle for controlled release applications. Commonly applied in drug delivery systems, especially in prodrug design and targeted therapeutics where light-triggered activation is desired. Also utilized in the development of enzyme substrates and biochemical probes due to the nicotinamide-like structure, supporting studies in deacetylase enzyme activity. Its orthogonal protection strategy supports solid-phase peptide synthesis, allowing precise construction of complex biomolecules.