Prepn: Kaufmann, Stamm, Ber. 91, 2121 (1958); Bhattacharyya et al., Chem. Ind. (London) 1959, 1352; Hünig, Ledle, Ber. 93, 913 (1960). Metabolism: Boyer, Scheig, Lipids 4, 615 (1969). Toxicity study: L. Or"o, A. Wretlind, Acta Pharmacol. Toxicol. 18, 141 (1961).