Abstract
A new homomonoterpene, 1,3,3-trimethyl-7-oxabicyclo[3.1.1]hexa-9-en-10-oic acid, named madhusic acid A (1), together with ten known compounds (2-11) were isolated from the methanolic extract of the dried leaves of Madhuca pasquieri (Dubard) H. J. Lam. The structure of the new compound was elucidated on the basis of 1D, 2D NMR (COSY, HMQC, and HMBC) and mass spectral analyses. We examined the effects of the isolated compounds against LPS-induced NO production in macrophage RAW264.7 cells and compound 2 showed effective activity with an IC50 value of 14.5 μM.
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