Glisoprenins are unique fungal polyisoprenepolyols with nine isoprene units from Gliocladium spp. Herein, glisoprenin G (1), a new member of glisoprenins group, along with a biosynthetically related known analogue glisoprenin F (2), were isolated and identified from an endophytic fungus, Gliocladium sp. F1, harboured in the roots of the Chinese medicinal plant Mahonia fortunei. The chemical structure of 1 showed the unusual loss of two isoprene carbon atoms and was determined by HRMS and NMR data. Compounds 1 and 2 showed moderate cytotoxic activity.
Keywords: Endophytic fungus; Gliocladium; cytotoxic activity; glisoprenins; polyterpenoids.