Lignans that contain either isomer of the 7,8'-epoxylignan skeleton. The first isomer consists of a tetrahydrofuran that carries a phenyl group at the 2- and the 4-positions, as well as one a methyl group at the 3- and 5-positions. The second isomer consists of a tetrahydrofuran that carries a benzyl group, a phenyl group, and a methyl group at the 2-, 4-, 5-position, respectively.
