Definition of "corrin" []

• A molecular species that contains four reduced pyrrole rings joined in a macrocycle by three -CH= groups and one direct bond; central to the cobalt containing vitamin cobalamin (noun)

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• "The interatomic distances in the inner ring of factor VIa, which has been called the corrin ring, conform very closely with the distances proposed 12 for a structure containing six resonating double bonds, so closely as to leave almost no doubt of the correct formulation of its chemical structure (cf.Fig. 9)."
• "[ORIGINAL MARGINAL NOTE IN MANUSCRIPT:] corrin: 15: 42"
• "One of the features of the corrin nucleus in the natural compounds is that even the inner ring is not quite planar."