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(1)corrin ring
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(2)dimethylbenzimidazole + ribose 3-phosphate + aminoisopropanol
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¡VCN ( cyanocobalamin )
¡VOH ( Hydroxocobalamin )
¡VCH3 ( Methylcobalamin )
¡Vdeoxyadenosyl ( 5 ' - Deoxyadenosylcobalamin )
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