title: THE INFLUENCE OF HETEROATOMS AND SUBTITUENTS ON THE TAUTOMERIC EQUILIBRIA IN BIOCHEMICAL PURINES AND PYRIMIDINES. I. AZAPURINES AND AZAPYRIMIDINES.
mesh_terms: D000225:Adenine; D000588:Amines; D003596:Cytosine; D006147:Guanine; D007042:Hypoxanthines; D007097:Imines; D007700:Kinetics; D009584:Nitrogen; D011687:Purines; D011743:Pyrimidines; D012106:Research; D013941:Thymine; D014498:Uracil; D014970:Xanthines
chemical_list: D000588:Amines; D007042:Hypoxanthines; D007097:Imines; D011687:Purines; D011743:Pyrimidines; D014970:Xanthines; D014498:Uracil; D006147:Guanine; D003596:Cytosine; D000225:Adenine; D009584:Nitrogen; D013941:Thymine; C030985:purine
keywords: ADENINE; AMINES; CYTOSINE; EXPERIMENTAL LAB STUDY; GUANINE; HYPOXANTHINES; IMINES; KINETICS; NITROGEN; THYMINE; URACIL; XANTHINES