Oleanane-Type Triterpenoids from the Endophytic Fungus Pestalotiopsis clavispora Isolated from the Chinese Mangrove Plant Bruguiera sexangula.

Three new triterpenoid derivatives, named (15 α)-15-hydroxysoyasapogenol B (), (7 β,15 α)-7,15-dihydroxysoyasapogenol B (), and (7 β)-7,29-dihydroxysoyasapogenol B (), 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. [ABSTRACT FROM AUTHOR]