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1H-Benzo[D]Imidazol-5-ol is a pathway intermediate in the anaerobic biosynthesis of the lower ligand of vitamin B12 (cobalamin).

ChEBI: 5-hydroxybenzimidazole is a member of the class of benzimidazoles that is 1H-benzimidazole carrying a single hydroxy substituent at position 5. It has a role as a human metabolite, a rat metabolite and a bacterial metabolite. It is a member of benzimidazoles and a member of phenols. It derives from a hydride of a 1H-benzimidazole.