corrin

corrin
The cyclic system of four pyrrole rings forming corrinoids, which are the central structure of the vitamins B12 and related compounds, differing from porphin (porphyrin) in that two of the pyrrole rings are directly linked (C-19 to C-1). [fr. core (of vitamin B12 molecule)]

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cor·rin (korґin) a tetrapyrrole ring system resembling the porphyrin ring system of hemoglobin, but in which a pair of the rings is joined directly rather than through a methylene bridge, with cobalt being bound to the inner four nitrogen atoms. The cobalamins contain a corrin ring system.

Medical dictionary. 2011.

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