Two new flavanones from Polytrichum commune Hedw.

Seven flavanones, including two new compounds coupled with styryl units, communins C ( 1 ) and D ( 2 ), as well as five known compounds, were isolated from Polytrichum commune Hedw. The planar structures of all compounds were determined using extensive spectroscopic analysis. The absolute configurations of two new compounds were assigned by comparing experimental ECD with calculated ECD. The cytotoxicity of all isolates against HCT-116, BGC803, MCF7 and PANC-1 cell lines was evaluated. Communin D exhibited significant cytotoxic activity on BGC803 cells with an IC 50 value of 9.3 μM.