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Catalyst series     more > 4-Dimethylaminopyridine Tetrabutylammonium bromide Tetraethylammonium bromide Amino acid series more > L-tyrosine L-leucine L-threonine Other products    more > 4-Methoxyphenol (MEHQ) 4-tert-Butylcatechol (TBC) Phenothiazine