Trichalasins C and D from the plant endophytic fungus Trichoderma gamsii.

Two new cytochalasans, trichalasins C (1) and D (2) together with known cytochalasans aspochalasins D (3), M (4) and P (5) were isolated from one endophytic fungus Trichoderma gamsii inhabiting in traditional medicinal plant Panax notoginseng (BurK.) F.H.Chen. The structures for the new compounds 1 and 2 were determined by NMR and HRESIMS, and their relative configurations were established by analysis of coupling constants and NOESY correlations. Compound 3 displaying inhibitory activity with EC₅₀ value 5.72 μM, whereas the EC₅₀ values for compounds 1, 2 and 4, 5 are more than 40 μM.