A series of 19 new 2-{[2-(1H-imidazol-1-yl) ethyl] sulfanyl}-1H-benzimidazole derivatives was synthesized starting from the properly substituted 1, 2-phenylendiamine. These compounds have hydrogen or methyl at position 1; while hydrogen, chlorine, ethoxy or methoxycarbonyl group is at position 5 and/or 6. The novel compounds were tested against protozoa Trichomonas vaginalis, Giardia intestinalis and Entamoeba histolytica. ...