porphyrin
noun
por·phy·rin
ˈpȯr-fə-rən
: any of various compounds with a macrocyclic structure that consists essentially of four pyrrole rings joined by four =CH− groups
especially
: one (such as chlorophyll or hemoglobin) containing a central metal atom and usually exhibiting biological activity
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Merriam-Webster unabridged
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