Fmoc-Abu(3-N3) (Fmoc-Abu(3-N3)-OH) (2R,3R) is a click chemistry reagent containing an azide group. Fmoc-Abu(3-N3) (2R,3R) can be used for the research of various biochemical. 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.