hemes (heme derivatives)

https://doi.org/10.1351/goldbook.H02773
Complexes consisting of an iron ion coordinated to a porphyrin acting as a tetradentate ligand, and to one or two axial @L03518@.
H02773.png
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1339 [Terms] [Paper]
See also:
White Book, 2nd ed., p. 311 [Terms] [Book]