title: Intramolecular hydrogen bonding in metal--purine systems. Synthesis and structure of a cobalt(III)--Theophylline complex.
mesh_terms: D001665:Binding Sites; D003035:Cobalt; D003461:Crystallography; D008961:Models, Structural; D009690:Nucleic Acid Conformation; D011485:Protein Binding; D011687:Purines / Q000138:chemical synthesis*; D013806:Theophylline / Q000138:chemical synthesis*
chemical_list: D011687:Purines; D003035:Cobalt; D013806:Theophylline