4-Pyridinecarbonyl Azide is an intermediate in the synthesis of 4-Isocyanatopyridine (I809020). 4-Isocyanatopyridine is used in the preparation of thiadiazolopiperazinyl ureas as inhibitors of fatty acid amide hydrolase as well as the preparation of pyridyl-substituted pyrazolotriazolopyrimidine as a water-soluble human A3 adenosine receptor antagonist.