New Xanthones with Antiagricultural Fungal Pathogen Activities from the Endophytic Fungus L17.

Six new xanthone dimers, diaporxanthones A-F (-), and an unusual xanthone monomer diaporxanthone G (), in addition to seven known analogues (-), were isolated and identified from endophytic L17 harbored in the fruits of the salt-tolerant plant . The chemical structures of these metabolites were elucidated on the basis of nuclear magnetic resonance, high-resolution electrospray ionization mass spectrometry, and reported data in the literature. Their absolute configurations were established by single-crystal X-ray diffraction analysis together with time-dependent density functional theory electronic circular dichroism calculations. Among these compounds, compounds and exhibited moderate antifungal activities against sp. and and compound showed significant cytotoxicity against all selected five cancer cell lines.