title: Letter: Lanthanide porphyrin complexes. A potential new class of nuclear magnetic resonance dipolar probe.
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D005063:Europium; D009682:Magnetic Resonance Spectroscopy; D011166:Porphyrins; D011221:Praseodymium; D013113:Spin Labels; D015018:Ytterbium
chemical_list: D011166:Porphyrins; D013113:Spin Labels; D005063:Europium; D015018:Ytterbium; D011221:Praseodymium