title: Purines, pyrimidines, and imidazoles. XXVI. Active esters of some 5-aminoimidazole-4-carboxylic acids and their use in the preparation  of 5-aminoimidazole-4-carboxyamides and their nucleoside and nucleotide derivatives.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D007093:Imidazoles; D009705:Nucleosides; D009711:Nucleotides; D011687:Purines; D011743:Pyrimidines
chemical_list: D007093:Imidazoles; D009705:Nucleosides; D009711:Nucleotides; D011687:Purines; D011743:Pyrimidines