(2R,4R)-Fmoc-D-Pro(4-N3)-OH

(2R,4R)-Fmoc-D-Pro(4-N3)-OH (cis-4-Azido-N-Fmoc-D-proline) is a click chemistry reagent containing an azide group. 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.