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Elemicin

Elemicin is a phenylpropene, a natural organic compound, and is a constituent of the essential oil of nutmeg. It is partially responsible for the psychoactive effects of nutmeg. It is also a minor constituent of the oleoresin and essential oil of Manila elemi.

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Estetrol

Estetrol is a metabolite of Estradiol. It is an estrogenic steroid synthesized exclusively by the fetal liver during human pregnancy and reaching the maternal circulation through the placenta.

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Ethylene

Ethylene is a gaseous organic compound. It is the simplest alkene. It is widely used in industry and is also a plant hormone. It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves. Ethylene is oxidized to produce ethylene oxide, a key raw material in the production of surfactants and detergents by ethoxylation. Ethylene undergoes polymerization to polyethylene, a plastic material having many uses, particularly in packaging films, wire coatings, and squeeze bottles.

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Etizolam

Etizolam is a certified reference material categorized as a thienodiazepine.

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Eugeniin

Eugeniin is the first of the ellagitannins formed from pentagalloyl glucose. It can be found in Geum japonicum and Syzygium aromaticum. The compound shows anti-herpesvirus properties.

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Fayalite

Fayalite is the iron-rich end-member of the olivine solid-solution series. It can react with oxygen to produce magnetite and quartz: the three minerals together make up the "FMQ" oxygen buffer. The reaction is used to control the fugacity of oxygen in laboratory experiments. It can also be used to calculate the fugacity of oxygen recorded by mineral assemblages in metamorphic and igneous processes.

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Fenthion

Fenthion is an organothiophosphate used as an insecticide.

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Francium

Francium has one of the lowest electronegativities of all known elements, and is the second rarest naturally occurring element. It is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron. It was discovered by Marguerite Perey in France in 1939. It was the last element discovered in nature, rather than by synthesis. Due to its instability and rarity, there are no commercial applications for francium. It has been used for research purposes in the fields of biology and of atomic structure. Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical. Its ability to be synthesized, trapped, and cooled, along with its relatively simple atomic structure have made it the subject of specialized spectroscopy experiments. These experiments have led to more specific information regarding energy levels and the coupling constants between subatomic particles.

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