Abstract
Phytochemical investigation of the fruits from Vitex kwangsiensia led to the isolation of 18 constituents, including 6 lignans (1-6), 3 diterpenoids (7-9), 2 sesquiterpenoids (10, 11), 2 triterpenoids (16, 17), and 5 other compounds. Their structures were identified by spectroscopic methods (mass spectroscopy, infrared, UV, 1-dimensional and 2-dimensional nuclear magnetic resonance) and comparison with reported data in the literatures. Among these constituents, compound 1 was a new lignan and named as vitekwangin A. The spectroscopic data of 2 was reported herein for the first time, and given a trivial name vitekwangin B. The isolated lignans, diterpenoids, and sesquiterpenoids were evaluated for their inhibitory activity to prevent nitric oxide production in lipopolysaccharide-stimulated RAW264.7 macrophages.
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