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Under the bioassay-guided method, two diterpenes, 3-O-(2″,3″-dimethylbutanoyl)-13-Ododecanoylingenol (1) and 3-O-(2″,3″-dimethylbutanoyl)-13-O-decanoylingenol (2) isolated from Euphorbia kansui, showed a pronounced antinematodal activity against the nematode Bursaphelenchus xylophilus at the same minimum effective dose (MED) of 5 μg per cotton ball and still displayed antinematodal activity at a dose of 2.5 μg per cotton ball. Compounds 3 − 6 were obtained, and the structure of the new compound 6 was elucidated based on 1D-and 2D-NMR analyses and physicochemical data. Preliminary structure-biological activity relationships of ingenane-type compounds were deduced.

zeitschrift für naturforschung c

Antinematodal Activities of Ingenane Diterpenes from Euphorbia kansui and their Derivatives against the Pine Wood Nematode (Bursaphelenchus xylophilus)