Solalyratins A and B, new anti-inflammatory metabolites from Solanum lyratum.

A new coumestan (solalyratin A, 1) and a novel cyclic eight-membered α,β-unsaturated ketone (solalyratin B, 3), together with three known compounds, puerariafuran (2), coumestrol (4) and 9-hydroxy-2',2'-dimethylpyrano[5',6':2,3]-coumestan (5), were isolated from the whole plant of Solanum lyratum. Their structures were elucidated on the basis of spectroscopic analyses. In vitro, compounds 1-5 showed anti-inflammatory activities, with IC(50) values in the range 6.3-9.1 μM.