![](http://www.alamy.com/thumbs/6/7BF8E7E4-21D4-4A4B-9A3A-683E5A19CDC9/K1BT79.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, vector, vectors, xanthic, xanthin, xanthine, xanthines, xanthinuria