Prepn and antiprotozoal activity: J. Heeres et al., DE 2429755; eidem, US 3928374 (both 1975 to Janssen); eidem, Eur. J. Med. Chem. - Chim. Ther. 11, 237 (1976). Crystal structure of monohydrate: N. M. Blaton et al., Acta Crystallogr. B35, 753 (1979). Clinical efficacy in vaginal trichomoniasis: A. Notowicz et al., Br. J. Vener. Dis. 53, 129 (1977); P. Chaudhuri, A. C. Drogendijk, Eur. J. Obstet. Gynecol. Reprod. Biol. 10, 325 (1980).