Secondary metabolites from a deep-sea derived fungal strain of Phomopsis lithocarpus FS508

One new isoindolinone lactam lithocarlactam A (1) and one new triterpene lithocarin D (2), along with nine known natural products (3-11) were isolated from the broth extract of marine fungus Phomopsis lithocarpus FS508, which was isolated from a deep-sea sediment sample. Their structures were elucidated by interpretation of spectroscopic analysis and comparison with previously published literatures for the known compounds. Moreover, compounds 1 and 2 were evaluated for cytotoxic activity against SF-268, MCF-7, HepG-2, and A549 cell lines. However, both of them showed no activity against the tumor cell lines.