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Angelic acid is an unsaturated aliphatic acid, meaning it contains a carbon-carbon double bond. It is a cis-trans isomer, with angelic acid being the cis form. This acid is found as an ester in angelica root. Angelic lactones are related chemical compounds derived from angelic acid. Unsaturated acids, like angelic acid, exhibit properties of both carboxylic acids and compounds with double bonds, undergoing addition and oxidation-reduction reactions.12

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