New Lignans from the Roots of Taiwania cryptomerioides Hayata

The five new lignans designated 3′,4′‐de‐O‐methylenehinokinin (1), taiwaninolide (2), 8′‐hydroxysavinin (3), isoguamarol (4), and 4′‐O‐methylsalicifolin (5), as well as the new 4‐(3,4‐dimethoxybenzyl)dihydro‐3‐(4‐hydroxybenzyl)furan‐2(3H)‐one (6) were isolated from the roots of Taiwania cryptomerioides, besides the three known compounds hinokinin (8), savinin (9), and 3,4‐de‐O‐methylenehinokinin (7). The structures of the new constituents were elucidated through chemical and spectral studies. A compound previously isolated from the heartwood of Chamaecyparis obtusa var. formosana was assigned structure 1; however, this structure has now been revised to be 3,4‐de‐O‐methylenehinokinin (7).