different between corrin vs corrinoid

English

corrin (plural corrins)

(organic chemistry) 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.
- 1998, Georgina Ferry, Dorothy Hodgkin: A Life:
  But the result showed unequivocally that the vitamin contained a ring system unlike any that had been seen before (it was later given the name ‘corrin’).

corrin

corrin +? -oid

corrinoid (plural corrinoids)

(chemistry) Any derivative of the corrin nucleus, which contains four reduced pyrrole rings joined in a macrocycle by three -CH= groups and one direct bond.

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