Penixanthones A and B, two new xanthone derivatives from fungus <i>Penicillium</i> sp. SYFz-1 derived of mangrove soil sample

<p>Two new xanthone derivatives, penixanthones A (<b>1</b>) and B (<b>2</b>), together with three known compounds, aspenicillide (<b>3</b>), 1,5-dihydroxy-3-methoxy-7-methyl-anthracene-9,10-dione (<b>4</b>) and 1,2-indandiol (<b>5</b>), were isolated from the ethyl acetate extract of a culture of the fungus <i>Penicillium</i> sp. SYFz-1, which was separated from a mangrove soil sample. The structures of these compounds were elucidated by spectroscopic methods including NMR and mass spectrometry. The absolute configurations of penixanthones A (1) and B (2) were determined on the basis of electronic circular dichroism (ECD) data analysis.