Cobalamin

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Cobalamin with the upper axial ligand noted as R

Cobalamin may refer to several chemical forms of vitamin B₁₂, depending on the upper axial ligand of the cobalt ion. These are:

Cobalamin is susceptible to acid. During its biosynthesis complexes are formed to protect it.

Bilanes
(Linear)

Phytobilins

Phytochromobilin

Phycobilins	Phycoerythrobilin Phycocyanobilin Phycourobilin Phycoviolobilin

Protoporphyrins	Protoporphyrin IX Heme (b, c, a, o) Zinc protoporphyrin Magnesium protoporphyrin

Phytoporphyrins	Chlorophyll c1 Chlorophyll c2 Protochlorophyllide

Reduced
porphyrins

Porphyrinogens	Uroporphyrinogen (I, III) Coproporphyrinogen (I, III) Protoporphyrinogen IX

Chlorins	Chlorophyllide (a, b) Chlorophyll (a, b) Phaeophytin (a, b) Bacteriochlorophyll c

Bacteriochlorins	Bacteriochlorophyll a

Isobacteriochlorins	Siroheme Sirohydrochlorin

Corphins	Cofactor F430

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