Two new pentacyclic triterpenoids from the stems of Manihot esculenta

In recent years, we have been engaged in a program to discover secondary metabolites with fascinating structural features and significant biological activities from Euphorbiaceae family. Two new pentacyclic triterpenoids, maesculentins A (1) and B (2), were isolated from the stems of Manihot esculenta Crantz, together with eleven known ones. The structures of two new triterpenoids (1–2) were elucidated by extensive spectroscopic techniques...