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Items: 18

1.

protoapigenone [Supplementary Concept]

has antineoplastic activity; isolated from Thelypteris torresiana; structure in first source

Date introduced: November 7, 2007

2.

Flavones

A group of 4-keto-FLAVONOIDS.

Year introduced: 2005, 1963-2003

3.
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.

Ketones

Organic compounds containing a carbonyl group =C=O bonded to two hydrocarbon groups.

6.

Hydrocarbons, Cyclic

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

Year introduced: 1998

7.

Hydrocarbons, Alicyclic

Organic compounds composed exclusively of carbon and hydrogen. Three or more carbon atoms are arranged in a cyclic structure and they possess aliphatic properties.

Year introduced: 1998

8.

Hydrocarbons

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

9.

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

10.

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

11.

Heterocyclic Compounds

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

12.

Flavonoids

A group of phenyl benzopyrans named for having structures like FLAVONES.

Year introduced: 2004(1963)

13.

Cycloparaffins

Alicyclic hydrocarbons in which three or more of the carbon atoms in each molecule are united in a ring structure and each of the ring carbon atoms is joined to two hydrogen atoms or alkyl groups. The simplest members are cyclopropane (C3H6), cyclobutane (C4H8), cyclohexane (C6H12), and derivatives of these such as methylcyclohexane (C6H11CH3). (From Sax, et al., Hawley's Condensed Chemical Dictionary, 11th ed)

14.

Cyclohexanones

Cyclohexane ring substituted by one or more ketones in any position.

Year introduced: 1991(1975)

15.

Cyclohexanes

Six-carbon alicyclic hydrocarbons.

Year introduced: 1975

16.
17.

Benzopyrans

Compounds with a core of fused benzo-pyran rings.

Year introduced: 1966

18.

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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