Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. biological material
7. animal material
8. processed animal material

Anotations

Scope note:

A feebly basic compound (C5H4N4O2) allied to uric acid, found in various organs and secretions of the animal body and from plants, that forms a lemon-yellow compound with nitric acid. It is derived from guanine and hypoxanthine, and yields uric acid on oxidation.