Prepn: Pianka, Polton, US 3234082; US 3234260 (both 1966 to Murphy Chem.). Metabolism studies: Bandal, Casida, J. Agric. Food Chem. 20, 1235 (1972). Toxicity study: T. B. Gaines, Toxicol. Appl. Pharmacol. 14, 515 (1969).