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Structure of cobalamin and benzimidazole lower ligands. (A) Structure of cobalamin. The lower ligand, 5,6-dimethylbenzimidazole (DMB) is boxed. (B) Structures of lower ligands used in this study. 5-methylbenzimidazole (5-MeBza), 5-methoxybenzimidazole (5-OMeBza), 5-hydroxybenzimidazole (5-OHBza), and benzimidazole (Bza).
