Sesquiterpene Alkaloids from Extracts of Tripterygium wilfordii.

Five new sesquiterpene pyridine alkaloids, named wilfordinines D (1), E (2), F (3), G (4) and H (5), along with six known compounds have been isolated from the extracts (TII) of Tripterygium wilfordii Hook F. Their structures were elucidated by spectroscopy.