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Items: 7

2.

Piperidines

A family of hexahydropyridines.

Year introduced: AZACYCLONOL was heading 1963-1984

3.

Indoles

Benzopyrroles with the nitrogen at the number one carbon adjacent to the benzyl portion, in contrast to ISOINDOLES which have the nitrogen away from the six-membered ring.

4.

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

5.

Heterocyclic Compounds, 1-Ring

Organic compounds that contain a ring structure made up of carbon and one or more additional elements such as nitrogen and oxygen.

Year introduced: 1998

6.

Heterocyclic Compounds

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

7.

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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