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Tiglic acid
|Section2= }} Tiglic acid is a monocarboxylic unsaturated organic acid. It is found in croton oil and in several other natural products. It was also isolated from the defensive secretion of certain beetles.〔Attygalle, A. B.; Wu, X.; Will, K. W. (2007). "Biosynthesis of tiglic, ethacrylic, and 2-methylbutyric acids in a carabid beetle, ''Pterostichus (Hypherpes) californicus''". ''J Chem Ecol.'' 33: 963–970. PMID 17404818.〕 ==Properties and uses== Tiglic acid has a double bond between the second and third carbons of the chain. Tiglic acid and angelic acid form a pair of ''cis-trans'' isomers. Tiglic acid is a volatile and crystallizable substance with a sweet, warm, spicy odour. It is used in making perfumes and flavoring agents. The salts and esters of tiglic acid are called tiglates.
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