| 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). Origin: fr. Core (of vitamin B12 molecule) (05 Mar 2000) |
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| corrinoid | A compound containing a corrin ring. (05 Mar 2000) |