Three new compounds, an open-chain cytochalasan scoparasin C (1), a pyrichalasan scoparasin D (2), and a β-eudesmol type sesquiterpene scopararane C (5), along with three known compounds (3, 4 and 6), were isolated from the marine fungus Eutypella scoparia 1-15. Their structures were determined on the basis of comprehensive NMR and MS analysis. Compound 2 exhibited potent cytotoxicities with very low IC50 values against several cancer cell lines, including A375, A549, HepG2 and MCF-7.