MeSH

Date introduced: June 2, 2017

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

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

Year introduced: 2017

Carboxylic acids that have a homocyclic ring structure in which all the ring atoms are carbon.

Year introduced: 1998

Organic compounds containing the -CO-NH2 radical. Amides are derived from acids by replacement of -OH by -NH2 or from ammonia by the replacement of H by an acyl group. (From Grant and Hackh's Chemical Dictionary, 5th ed)

Five membered rings containing a NITROGEN atom.

BENZOIC ACID amides.

Year introduced: 1973

Organic compounds derived from BENZENE.

Year introduced: 1968

Derivatives of BENZOIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the carboxybenzene structure.

Year introduced: 1963

Organic compounds containing the carboxy group (-COOH). This group of compounds includes amino acids and fatty acids. Carboxylic acids can be saturated, unsaturated, or aromatic.

Year introduced: 1973(1971)

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

Pyridine derivatives with one or more keto groups on the ring.

Year introduced: 1968

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

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

Organic compounds containing carbon and hydrogen in the form of an unsaturated, usually hexagonal ring structure. The compounds can be single ring, or double, triple, or multiple fused rings.

Year introduced: 1998

Organic compounds composed exclusively of carbon and hydrogen forming a closed ring that may be either alicyclic or aromatic.

Year introduced: 1998

A group of heterocyclic aromatic organic compounds consisting of the fusion of BENZENE and PYRAZOLES.

Year introduced: 1991(1971)

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

Compounds that are derived from PIPERAZINE.

Azoles of two nitrogens at the 1,2 positions, next to each other, in contrast with IMIDAZOLES in which they are at the 1,3 positions.