separation of extracts from the culture broth and mycelium of the fungus Trichothecium roseum, aiming at the discovery for cancer preventive agents, resulted in the isolation of three newtrichothecene sesquiterpenes, trichothecinols A-C (1-3) together with three known analogues, trichothecin (4), trichodermol (5) and trichothecolone (6). Compounds 1-6 exhibited remarkably potent inhibition against Epstein-Barr