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Heterocyclic Compounds, 2-Ring

Definition:	A class of organic compounds containing two ring structures, one of which is made up of more than one kind of atom, usually carbon plus another atom. The heterocycle may be either aromatic or nonaromatic.
Notes:	GEN; prefer specifics; used for mapping supplementary chemicals

Heterocyclic Compounds, 2-Ring Categories.

	Benzazepines
	Benzimidazoles
	Benzofurans
	Benzopyrans - Compounds with a core of fused benzo-pyran rings.
	Benzothiadiazines
	Benzothiepins
	Benzoxazoles
	Benzoxepins
	Indoles
	Indolizines
	Isoquinolines - A group of compounds with the heterocyclic ring structure of benzo(c)pyridine. The ring structure is characteristic of the group of opium alkaloids such as papaverine. (From Stedman, 25th ed)
	Naphthyridines
	Pteridines - Compounds based on pyrazino[2,3-d]pyrimidine which is a pyrimidine fused to a pyrazine, containing four NITROGEN atoms.
	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.
	Quinazolines
	Quinolines
	Quinolizines
	Quinoxalines

Heterocyclic Compounds, 2-Ring Definitions and Terms

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