1,4,7,10-Tetraazacyclododecane

Its nitrogen-rich cyclic structure allows it to act as a strong chelating ligand for metal ions, making it widely used in coordination chemistry, radiopharmaceuticals, and catalysis. 1,4,7,10-Tetraazacyclododecane, often known as cyclen, is a 12-membered macrocyclic compound containing four nitrogen atoms at positions 1, 4, 7, and 10.