Benzimidazole derivative effective against liver fluke. Prepn: J.-J. Gallay et al., BE 865870 corresp to US 4197307 (1978, 1980 both to Ciba-Geigy). Efficacy against immature and mature Fasciola hepatica in sheep, goats: K. Wolff et al., Vet. Parasitol. 13, 145 (1983); in sheep: J. C. Boray et al., Vet. Rec. 113, 315 (1983). Effective also against F. gigantica in sheep: N. Güralp, R. Tinar, J. Helminthol. 58, 113 (1984). Brief review: J. Eckert et al., Biol. Muench. Tieraerztl. Wochenschr. 97, 349 (1984).