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ArtistThe omega-3 fatty acids are a family of polyunsaturated fatty acids with a double bond at the third carbon atom from the methyl end of the carbon chain. The most common types of omega-3 fatty acids are alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). Here is the chemical structure of alpha-linolenic acid, which is an 18-carbon omega-3 fatty acid: CH3(CH2)3CH=CHCH2CH=CHCH2CH=CH(CH2)7COOH In this structure, the double bond at the third carbon atom is indicated by the "=CH" symbol, and the carboxyl group (-COOH) at the end of the carbon chain is responsible for the acidic properties of fatty acids. EPA and DHA have longer carbon chains and more double bonds than ALA, but they also have a double bond at the third carbon atom from the methyl end, which makes them members of the omega-3 family.
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