Lignans and Terpenoids From the Fruits of Vitex kwangsiensia and Their Inhibitory Activity on Nitric Oxide Production in Macrophages

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.