Porphyrin
From Proteopedia
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Porphyrins are a macrocyclic compounds containing four pyrole rings. Can you identify them in the scene to the right? The four pyrole rings are connected together by four . Porphyrins are distinguished from each other by the substituents attached to the pyrole rings. Can you identify the pyrole substituents on this porphyrin (protoporphyrin IX)? They are , and groups.
