Halquinol is an important chlorinated derivative of 8 hydroxy quinolines and its molecular formula is C9H5ClNOR, CAS no. 8067-69-4. It mainly contains 5,7-dichloro-8 hydroxyquinoline and 5-chloro-8 hydroxyquinoline as major components while 7 –chloro- 8 hydroxyquinoline is present as a minor component. It is recognized as one of the most approved non-antibiotic, antimicrobial agents and also as an excellent performance promoter in poultry and swine. As the world’s largest halquinol producer Quadragen has a state-of-the-art facility with an R&D facility for halquinol.