Imidazole nucleosides and nucleotides.
D000470:Alkaloids; D055598:Chemical Phenomena; D002621:Chemistry; D006632:Histamine; D006639:Histidine; D007093:Imidazoles; D009705:Nucleosides / Q000138:chemical synthesis; D009711:Nucleotides / Q000138:chemical synthesis
D000470:Alkaloids; D007093:Imidazoles; D009705:Nucleosides; D009711:Nucleotides; D006639:Histidine; D006632:Histamine