Note: A new diterpenoid and active stilbenes from Pinus armandii heartwood

Abstract 8(17),13-Labdadien-16,14-olid-18-oic acid (1), a new diterpenoid, has been isolated from the heartwood of Pinus armandii Francher, along with seven known diterpenoids (2–8) and four known stilbenes (9–12). Their structures have been elucidated by spectral evidence. (E)-3-Hydroxy-5-methoxystilbene (9) showed significant inhibition against white-rot fungi. Keywords: Pinus armandii8(17), 13-Labdadien-16, 14-olid-18-oic acidDiterpenoidStilbeneWhite-rot fungi Acknowledgements All spectra were measured by the analytical group of the State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences.