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H-L-Lys(4-N3-Z)-OH hydrochloride is a click chemistry reagent containing an azide group. H-L-Lys(4-N3-Z)-OH hydrochloride contains a lysine-modified azide moiety and as a bioorthogonal ligation handle. H-L-Lys(4-N3-Z)-OH hydrochloride is an infrared probe and a photo-affinity reagent[1][2]. It contains an azide group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing alkyne groups. It can also undergo ring strain-promoted alkyne-azide cycloaddition (SPAAC) with molecules containing DBCO or BCN groups.

[1] Ge Y, et, al. A genetically encoded multifunctional unnatural amino acid for versatile protein manipulations in living cells. Chem Sci. 2016 Dec 1;7(12):7055-7060. DOI:10.1039/c6sc02615j
[2] Wesalo JS, et, al. Phosphine-Activated Lysine Analogues for Fast Chemical Control of Protein Subcellular Localization and Protein SUMOylation. Chembiochem. 2020 Jan 15;21(1-2):141-148. DOI:10.1002/cbic.201900464