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Chemical structure of cobalamins. Depending on the ligand (R), there are 6 chemical compounds of the cobalamin family: CN—cyanocobalamin (CNCbl); CH3—methylcobalamin (MeCbl); 5-deoxyadenosine—adenosylcobalamin (AdoCbl); H2O—aquacobalamin (AqCbl); OH—hydroxocobalamin (-OHCbl); glutathion—glutathionylcobalamin [1,2].
