A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include ADENINE and GUANINE, constituents of nucleic acids, as well as many alkaloids such as CAFFEINE and THEOPHYLLINE. Uric acid is the metabolic end product of purine metabolism.
D003497
Cyclic N-Oxides
Heterocyclic compounds in which an oxygen is attached to a cyclic nitrogen.
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D006147
Guanine
D006898
Hydroxylamines
Organic compounds that contain the (-NH2OH) radical.
D006900
Hydroxylation
Placing of a hydroxyl group on a compound in a position where one did not exist before. (Stedman, 26th ed)