from The Century Dictionary and Cyclopedia
- n. A substance derived from purine by replacing hydrogen by hydroxyl, as 6-oxypurine or hypoxanthine (C5H4ON4), 2,6-dioxypurine or xanthine (C5H4O2N4), and 2,6,8-trioxy-purine or caffeine (C5H4O3N4).
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