Prepn: GB 1123317 corresp to P. P. Actor, J. F. Pagano, US 3574845 (1968, 1971 both to SK & F). Comparative anthelmintic effects in mice: C. S. Karunakaron, D. A. Denham, J. Parasitol. 66, 929 (1980). Clinical studies in foals and horses: J. H. Drudge et al., Am. J. Vet. Res. 42, 526 (1981); E. T. Lyons et al., ibid. 685; D. K. Hass et al., ibid. 43, 534 (1982).