A new xanthone from the fungus Apiospora montagnei.

A new xanthone derivative, methyl 8-hydroxy-3-hydroxymethylxanthone-1-carboxylate (1), and seven known compounds, 8-hydroxy-3-methylxanthone-1-carboxylate (2), methyl 8-hydroxy-6-methylxanthone-1-carboxylate (3), ergosterol (4), cyathisterone (5), ergosta-4,6,8(14),22-tetraen-3-one (6), calvasterone (7) and 2-hexyl-3-methylmaleic anhydride (8) were first isolated from the fungus Apiospora montagnei. Their structures were elucidated on the basis of spectroscopic analysis (UV, IR, MS, 1D, and 2D NMR). Compounds 5 and 6 showed weak to very weak cytotoxicity against cancer cell lines, NCI-H187 and KB.