title: Formation of urea and guanidine by irradiation of ammonium cyanide.
mesh_terms: D005075:Biological Evolution; D002845:Chromatography; D003486:Cyanides / Q000528:radiation effects*; D006146:Guanidines / Q000138:chemical synthesis*; D000069497:Origin of Life; D000644:Quaternary Ammonium Compounds / Q000528:radiation effects; D011830:Radiation Effects; D013472:Sunlight; D014466:Ultraviolet Rays; D014508:Urea / Q000138:chemical synthesis*
chemical_list: D003486:Cyanides; D006146:Guanidines; D000644:Quaternary Ammonium Compounds; D014508:Urea