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[edit] Nomenclature There are two different ways to make clear where the double bonds are located in molecules. For example: cis/trans-Delta-x or cis/trans-Δx: The double bond is located on plump women the xth carbon-carbon bond, counting from the carboxyl terminus. The cis or trans notation indicates whether the molecule is arranged in a cis plump women or trans conformation. In the case of a molecule having more than one double bond, the notation is, for example, cis,cis-Δ9,Δ12. Omega-x plump women or ω-x : A double bond is located on the xth carbon-carbon bond, counting from the ω, (methyl carbon) end. Example of unsaturated fatty acids: Alpha-linolenic acid: CH3CH2CH=CHCH2CH=CHCH2CH=CH(CH2)7COOH Docosahexaenoic acid Eicosapentaenoic acid Linoleic acid: CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH Arachidonic acid CH3(CH2)4CH=CHCH2CH=CHCH2CH=CHCH2CH=CH(CH2)3COOHNIST Oleic acid: CH3(CH2)7CH=CH(CH2)7COOH Erucic acid: CH3(CH2)7CH=CH(CH2)11COOH Alpha-linolenic, docosahexaenoic, and eicosapentaenoic acids are examples of omega-3 fatty acids.
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