Three new tetrahydrofuran-type sesquilignans, called saucerneol A, saucerne
ol B and saucerneol C were isolated from the underground parts of Saururus
chinensis (Saururaceae), together with known lignans, di-O-methyltetrahydro
furiguaiacin B, machilin D and machilin D 4-methyl ether. Their structures
were established from several spectral data.