Oleanane-type triterpenoids from the endophytic fungus pestalotiopsis clavispora isolated from the chinese mangrove plant bruguiera sexangula

摘要

Three new triterpenoid derivatives, named (15α)-15- hydroxysoyasapogenol B (1), (7β,15α)-7,15-dihydroxysoyasapogenol B (2), and (7β)-7,29-dihydroxysoyasapogenol B (3), were isolated from cultures of the plant endophytic fungus Pestalotiopsis clavispora. Their structures and relative configurations were elucidated by extensive spectroscopic analysis and X-ray crystallography.