Bioactive Tyrosine-Derived Cytochalasins from Fungus Eutypella sp D-1

Three new cytochalasins Z(24), Z(25), Z(26) (1-3, resp.) and one known compound, scoparasin B (4), were isolated from the fungus Eutypella sp. D-1 isolated from the soil of high latitude of the Arctic. The structures of 1-3 were elucidated from spectroscopic data (NMR, MS). These compounds were evaluated for cytotoxic activities against several human tumor cell lines. Among them, compound 1 exhibited moderate cytotoxicity toward human breast cancer MCF-7 cell line with IC50 of 9.33M.