Definition: 'Pyrrole Nucleus'
pyrrole nucleusType: Term
1. of porphyrins, a cyclic tetrapyrrole; four pyrrole groups joined into an anular structure by way of –CH= (methylidyne) bridges between the α (2) position of one pyrrole and the α′ (5) position of another pyrrole, the fourth pyrrole being joined to the first.
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