The benzimidazole nucleus has been of considerable interest since it was noted that benzimidazole inhibits the growth of certain yeasts and bacteria. 2 The discovery of 5, 6- dimethylbenzimidazole as a unit in vitamin Blz has increased this interest. A number of alkyl benzimidazoles have been tested and found to have some anti-vitamin BIZ activity and some have been reported to have anti-viral activity also. That structural modifications can ...