Ch H3c

0 II

H3C H3C/

NH2 c=o

CH Cobalt

CH2 CH3

0 II

CH2 CH3

H\Ia

H0CH2

5,6-Dimethylbenzimidazole ribonucleotide Figure 1 Chemical structure of cobalamin (vitamin B12).

aquocobalamin are intermediates formed during the synthesis of the coenzyme forms. Other forms including sulfito-, nitrite-, and glutathionyl- derivatives of cobalamin have also been described but their role in metabolism is not known.

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