T. Morota et al., A NEW NOR-TRITERPENOID, TRIPTOLACTONE, WITH A NOVEL CARBON SKELETON FROM TRIPTERIGIUM-WILFORDII, Tetrahedron letters, 36(35), 1995, pp. 6291-6292
A nortriterpenoid with a novel carbon skeleton, designated triptolacto
ne, closely related to D:A-friedo-24-noroleanane triterpenoid has been
isolated from the root bark of Tripterigium wilfordii. The structure
was established by spectroscopic studies and X-ray crystallography.