porphyrins 

https://doi.org/10.1351/goldbook.P04765
Natural pigments containing a fundamental skeleton of four pyrrole nuclei united through the α-positions by four methine groups to form a macrocyclic structure (porphyrin is designated porphine in Chemical Abstracts indexes).
See also: corrinoids
Sources:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1360 [Terms] [Paper]
White Book, 2nd ed., p. 281 [Terms] [Book]
Citation: 'porphyrins' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04765 RIS BibTex EndNote
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Last revised: February 24, 2014