Dolabrane-type diterpenoid and lignan constituents from the stem barks of Ceriops Decandra (Griff.) W. Theob

Three dolabrane-type diterpenoids (1–3) and a lignan were isolated from a methanolic extract of C. decandra (Griff.) W. Theob. stem barks using various chromatographic separations. Their structures were elucidated to be tagalsine X, tagalsin P, ent-5α,2- oxodolabr-3-ene-3,15,16-triol, and pinoresinol by detailed analysis via spectroscopic techniques (1D, 2D NMR, and ESI-MS data) as well as comparison with those reported.