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H-L-Tyr(2-azidoethyl)-OH is a unnatural Tyrosine derivative. H-L-Tyr(2-azidoethyl)-OH is a click chemistry reagent containing an azide group[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] Tookmanian EM, et al. Azidoethoxyphenylalanine as a Vibrational Reporter and Click Chemistry Partner in Proteins. Chemistry. 2015 Dec 21;21(52):19096-103. DOI:10.1002/chem.201503908
[2] Maza JC, et al. Synthesis and Incorporation of Unnatural Amino Acids To Probe and Optimize Protein Bioconjugations. Bioconjug Chem. 2015 Sep 16;26(9):1884-9. DOI:10.1021/acs.bioconjchem.5b00424