Immunosuppressive terpenoids from Tripterygium wilfordii

Two new terpenes, triptobenzene P (1) and wilforone (2) were isolated from Tripterygium wilfordii, as well as 10 known terpenes. Their structures were elucidated by spectroscopic methods. Compounds 2–4, 8, 10, and 11 showed significant immunosuppressive activities.