A new sesquiterpene, a new monoterpene and other constituents with anti-inflammatory activities from the roots of Aristolochia debilis.

A new sesquiterpene (1) and a new monoterpene (2), together with thirteen known compounds (3-15) were isolated from an ethanol extract of the roots of Aristolochia debilis Sieb. et Zucc. The structures of compounds 1 and 2 were elucidated using HR-ESI-MS, 1D and 2D NMR spectroscopy. Anti-inflammatory effects of the isolated compounds were evaluated in terms of inhibition of nitric oxide, tumour-necrosis factor-α and interleukin-6 production in lipopolysaccharide-stimulated RAW264.7 cells. Compounds 1-9 and 12-15 significantly inhibited the levels of NO, TNF-α and IL-6 in LPS-induced RAW264.7 cells from concentrations of 3 μM to 30 μM.