title: Free radical formation in pyrimidine derivatives: a study of 5-nitrouracil at 77 K.
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D005615:Freezing; D011830:Radiation Effects; D014498:Uracil / Q000031:analogs & derivatives / Q000528:radiation effects*
chemical_list: D005609:Free Radicals; D014498:Uracil