| new azaphilones from the inedible mushroom hypoxylon rubiginosum. | fractionation of the methanol extract of the fruit bodies of the xylariaceus ascomycete hypoxylon rubiginosum resulted in the isolation of three new azaphilone derivatives named rubiginosins a-c (1-3) and a new fatty acid named rubiginosic acid (4), together with three known compounds, entonaemin a (5), daldinin c (6), and orsellinic acid. their structures were elucidated by 2d nmr, ms, ir, and uv spectra and chemical reaction. the absolute configuration of compound 3 was established by cd spect ... | 2004 | 15270570 |