Essential oil of fresh leaves from Myoporum bontioides A. Gray was analyzed by GC–MS. A total of nine components were identified in this volatile oil with epingaione (81.52 %) as a main constituent. Three flavonoids named isorhamnetin (1), 3,4’‐dimethoxy‐3’,5,7‐trihydroxyflavone (2) and luteolin (3) were isolated from the ethyl acetate fraction of Myoporum bontioides A. Gray leaves. Their structures were elucidated on the basis of spectroscopic data and by comparison with their spectral data reported in literature. The essential oil and ethyl acetate fraction from the leaves of this species expressed the toxicity to Spodoptera litura. In the antifeedant bioassay more than 50 % insects were killed after 48 h at 1.6 % and 4.0 % concentrations of the essential oil and ethyl acetate fraction, respectively.
The polar constituents of Clerodendrum inerme collected from coastal area of Thai Binh province were investigated. From the water soluble fraction of the C. inerme stems, four lignan and lignan glucosides (1‐4) along with a phenolic glucoside (5) were isolated. Their chemical structures were established as icariol A2 (1), syringaresinol‐4‐O‐β‐glucopyranoside (2), lariciresinol‐4‐O‐β‐D‐glucopyranoside (3), dehydrodiconiferyl alcohol‐4‐O‐β‐D‐glucopyranoside (4) and leonuriside A (5) by NMR spectroscopic and mass spectrometric analysis as well as comparison with those reported in the literature. Compounds 1, 2, 3 and 5 were found for the first time from this plant.
Five phenolic glycosides, clerodenoside A (1), seguinoside K (2), cistanoside D (3), verbascoside (4), and isoverbacoside (5) were isolated from the ethyl acetate soluble fraction of methanolic extract of the Clerodendrum inerme stems. Their structures were determined by spectroscopic analysis and comparison of spectral data with those reported in the literature. Compound 3 was isolated from this plant for the first time.
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