title: Regioselective base-catalyzed exchange of ring methyl protons in protoporphyrin IX. A new facet of porphyrin chemistry.
mesh_terms: D002384:Catalysis; D008665:Metalloporphyrins; D008745:Methylation; D011166:Porphyrins; D011524:Protoporphyrins
chemical_list: D008665:Metalloporphyrins; D011166:Porphyrins; D011524:Protoporphyrins