Used as an intermediate in the synthesis of reactive dyes, particularly for cotton and other cellulosic fibers. Its chloro-triazine group readily reacts with hydroxyl groups in fibers, forming stable covalent bonds that result in high color fastness. Also employed in the production of specialty polymers and as a coupling agent in peptide synthesis due to its ability to link amine-containing molecules. Commonly utilized in analytical chemistry for immobilizing biomolecules on solid supports.