title: Nitrogen-15 nuclear magnetic resonance studies of porphyrins.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D009682:Magnetic Resonance Spectroscopy; D008665:Metalloporphyrins; D009584:Nitrogen; D011166:Porphyrins; D015032:Zinc
chemical_list: D008665:Metalloporphyrins; D011166:Porphyrins; D015032:Zinc; D009584:Nitrogen