Vitamin B12 (cyanocobalamine)

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Vitamin B12 - Dark red crystals, C 63 H 90 CoN 14 O 14 P

The structure of Vitamin B12
Vitamin B12 consists of :
a monovalent cobalt metal at the center, surrounded by a porphyrin-like structure of
tetrapyrrole rings, bound to the metal center is a cyano group and a 5',6'-dimethylbenzimidazolyl nucleotide which is linked to the tetrapyrrole rings via a phosphate sugar linkage (!).