![](http://www.alamy.com/thumbs/6/A48E8FFC-B0BB-40FF-AD3D-FF485BA978EB/K1GCG5.jpg)
Xanthine purine base molecule. Skeletal formula.
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Keywords: acid, atomic, atoms, base, carbon, chemical, chemistry, composition, compound, drawing, flat, formula, hydrogen, icon, line, molecular, molecule, nitrogen, oxidase, oxygen, purine, skeletal, structure, uric, xanthic, xanthin, xanthine, xanthines, xanthinuria