Crystal Structure of 1-3-7-9 Tetramethyluric Acid and the Molecular Packing in Hydroxymethyl Purine Crystals


AS part of a programme of work on the investigation of the bond lengths and bond angles in purines1, the crystal structure of 1,3,7,9-tetramethyluric acid has been determined. In the preceding communication, de Santis, Giglio and Liquori have reported the crystal structure of this substance, but describe a different polymorphic form from the one given here. 
DOI: 10.1038/188047a0


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