A New Pyrrole Metabolite from the Endophytic Fungus of Xylaria papulis

One new pyrrole derivative, papupyrrolal (1), together with seven known metabolites consisting of three flavonoids [myricitrin (2), quercitrin (3), and myricetin (4)], and four triterpenoids [3 beta-trans-p-coumaroyloxy-2 alpha,23-dihydroxyolean-12-en-28-oic acid (5), chebuloside I (6), arjunolic acid (7), and taraxerol (8)] were isolated from the endophytic fungus Xylaria papulis BCRC 09F0222. Structures were established on the basis of their spectroscopic data, including H-1 NMR, C-13 NMR, HSQC, HMBC, as well as by HR-ESI-MS experiments and comparison with literature data. It is worthy to mention that this is the first report on secondary metabolites from this fungus.