Abstract
1. A substantial proportion of the radioactivity of an oral dose (1-20 mg/kg) of 3-phenoxy[14C]benzoic acid and the pyrethroid insecticide trans- and cis-[aryl-14C]cypermethrin (an α-cyano-3-phenoxybenzyl ester) is eliminated rapidly in urine of mice. 2. The major urinary metabolite of these compounds in two strains of mice is N-(3-phenoxybenzoyl)taurine. 3. Neither 3-phenoxybenzoic acid nor cypermethrin gives a taurine conjugate in rats. 4. Benzoic acid gives no taurine conjugate in mice.