Prepn: GB 813861 corresp to G. E. Ullyot, US 2921069 (1959, 1962 both to SK&F). Metabolism study: T. L. Flanagan et al., J. Pharm. Sci. 51, 996 (1962). Chromatographic studies: M. W. Anders, G. J. Mannering, J. Chromatogr. 7, 258 (1962); R. J. Warren et al., J. Pharm. Sci. 55, 144 (1966); B. B. Wheals, J. Chromatogr. 187, 65 (1980). Pharmacological studies: R. C. Kelsey, G. J. Frishmuth, Arch. Int. Pharmacodyn. Ther. 173, 44 (1968); E. W. Baur, J. Pharmacol. Exp. Ther. 177, 219 (1971).