Two new compounds named epipaxilline (1) and penerpene J (2) were isolated from the marine-derived fungus Penicillium sp. KFD28. Their structures including absolute configurations were determined on the basis of spectroscopic methods and ECD analysis. Compounds 1 and 2 showed inhibitory activities against PTP1B with IC50 values of 31.5 and 9.5 μM, respectively, and compound 2 also showed inhibitory activities against TCPTP with IC50 value of 14.7 μM.
Keywords: Indole-diterpenoid; Penicillium sp.; marine-derived fungus; protein phoshatases inhibitory activity.