title: Preparation and stereochemistry of an unusual copper(II)-purine complex. Axial and equatorial purine ligands in the square-pyramidal complex bis(theophyllinato)(diethylenetriamine)copper(II) dihydrate.
mesh_terms: D003300:Copper; D005029:Ethylenediamines; D008968:Molecular Conformation; D011687:Purines; D013237:Stereoisomerism; D013806:Theophylline / Q000031:analogs & derivatives*; D014961:X-Ray Diffraction
chemical_list: D005029:Ethylenediamines; D011687:Purines; D003300:Copper; D013806:Theophylline