Cobalamin with the upper axial ligand noted with R

Cobalamin may refer to several substances depending on the upper axial ligand of the cobalt ion. These are:

• Cyanocobalamin (R = -CN), which is not found in nature.
• Hydroxocobalamin (R = -OH)
• Methylcobalamin (R = -Me), which is an active form of vitamin B12.
• Adenosylcobalamin (R = -Ado), which is also an active form of vitamin B12.

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