As a part of our investigation into new anti-HIV agents, we report herein the isolation, structure elucidation, and biological activity of six new (1-6) and 20 known (7-26) pentacyclic lupane-type triterpenoids from the stem of Cassine xylocarpa and root bark of Maytenus cuzcoina. Their
In the present study we report the isolation of nine new olean-18-ene triterpenes (1-9), along with three known ones (10-12), from Cassine xylocarpa and Maytenus jelskii. Their stereostructures have been elucidated on the basis of spectroscopic analysis, including 1D and 2D NMR techniques (COSY,