title: Electron paramagnetic resonance spectra of some vitamin B 12 derivatives.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004578:Electron Spin Resonance Spectroscopy; D007093:Imidazoles; D011687:Purines; D014805:Vitamin B 12
chemical_list: D007093:Imidazoles; D011687:Purines; D014805:Vitamin B 12