from The Century Dictionary and Cyclopedia

  • Pertaining to or derived from alloxan and uric acid: noting certain bases comprising xanthin, hypoxanthin, episarcin, heteroxanthin, paraxanthin, theophyllin, theobromine, cafein, guanine, epiguanine, adenin, and carnin. They are all nuclear derivatives. Also termed xanthin bases or purin bases.


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