N,N'-Di-3-butyn-1-ylurea (Compound m7N) serves as a linker and is notable for its azide group content, making it a valuable click chemistry reagent. This type of chemistry is highly applicable in the joining of nucleic acids, lipids, proteins, and other molecules due to its advantageous qualities, including high yield, excellent specificity, and simplicity, leading to its widespread use in various research domains.