2, 5-Dioxo-1-pyrrolidinyl 11-azidoundecanoate

2,5 -Dioxo-1-pyrrolidinyl 11-azidoundecanoate is a linker containing an azide group and an NHS ester. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules.