Lignans and sesquiterpenoids from Lactuca sibirica.

From aerial parts of Lactuca sibirica, two new and one known furofuran lignans were isolated, together with four known lactucin-like guaianolides. On the basis of spectral data, the new lignans were characterized as acylated glucopyranosides of 4alpha, 8alpha-dihydroxypinoresinol.