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Aethusa cynapium L. - Apiaceae - fool's parsley, poison parseley, Hundspetersilie
Annual or biennial herb, native to Europe and northwestern Asia; leaves pinnate; flowers white.
http://www.floranordica.org/Review/-Review_public/accounts/Aethusa.html
A.cynapium contains toxic polyyne compounds like aethusin, aethusanol A and aethusanol B.
[Bohlmann, F., Arndt, C., Bornowski, H. and Herbst, P. (1960), Polyacetylenverbindungen, XXVI. Die Polyine aus Aethusa cynapium L. Chem. Ber., 93: 981–987. doi: 10.1002/cber.19600930433]
„Bioactivity guided fractionation of the anxiolytic methanol extract has led to the isolation of a novel unsaturated fatty acid. Structure of the acid characterized by UV, IR, 1H NMR, C13 NMR, MS techniques was found to be trideca-7, 9, 11-trienoic acid. Antianxiety activity was confirmed using the mCPP-induced hypolocomotion test. This new fatty acid — trideca-7,9,11-trienoic acid, isolated from A. cynapium was found to be responsible for the antianxiety activity of the plant.“
[A new anxiolytic fatty acid from Aethusa cynapium., Shri, R., Bhutani, K.K., Sharma, A., Fitoterapia, Vol.81(8), 2010, 1053-1057]