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Items: 9

2.

Purinones

Year introduced: 1968

3.

Purines

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.

4.

Organic Chemicals

A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.

Year introduced: 1998

5.

Hydrocarbons, Halogenated

Hydrocarbon compounds with one or more HYDROGEN atoms substituted with HALOGENS.

Year introduced: 1966

6.

Hydrocarbons

Organic compounds that primarily contain carbon and hydrogen atoms with the carbon atoms forming a linear or circular structure.

7.

Heterocyclic Compounds, 2-Ring

A class of heterocyclic compounds that include a two-ring fused structure. Both aromatic and non-aromatic ring structures are included in this category.

Year introduced: 1998

8.

Heterocyclic Compounds

Cyclic compounds that include atoms other than carbon in their ring structure.

9.

Heterocyclic Compounds, Fused-Ring

Multiple ring heterocyclic compounds containing two or more rings that share two atoms and one bond in common.

Year introduced: 2017

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