beta-Lac-TEG-N3 is a click chemistry reagent containing an azide group. beta-Lac-TEG-N3 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.