thumb|right|Corrin ring, numbered according to the 1975 IUPAC standard. Note that for consistency with the porphyrin numbering system, there is no 20 position. Positions 21-24 were numbered 20-23 in earlier literature. thumb|Vitamin B (cyanocobalamin) Corrinoids are a group of compounds based on the skeleton of corrin, a cyclic system containing four pyrrole rings similar to porphyrins. These include compounds based on octadehydrocorrin, which has the trivial name corrole.
thumb|right|Corrin ring, numbered according to the 1975 IUPAC standard. Note that for consistency with the porphyrin numbering system, there is no 20 position. Positions 21-24 were numbered 20-23 in earlier literature. thumb|Vitamin B (cyanocobalamin) Corrinoids are a group of compounds based on the skeleton of corrin, a cyclic system containing four pyrrole rings similar to porphyrins. These include compounds based on octadehydrocorrin, which has the trivial name corrole.
The cobalamins (vitamin B12) are the best known members of the group. Other prominent examples include cobyrinic acid and its ; cobinic acid and its hexaamide cobinamide; and cobamide.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).