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5,6-Dimethylbenzimidazole is a natural benzimidazole derivative. It is a component of vitamin B12 where is serves as a ligand for the cobalt atom.
5,6-Dimethylbenzimidazole is biosynthesized from flavin mononucleotide by the enzyme 5,6-dimethylbenzimidazole synthase.
References
Dimethylbenzimidazole Wikipedia(Text) CC BY-SA