A new radical scavenger, named phenopyrrozin, was isolated from the cu
lture broth of Penicillium sp. FO-2047. Phenopyrrozin was purified fro
m whole broth by solvent extraction, silica gel chromatography, and HP
LC. The structure of phenopyrrozin was elucidated as 5,6,7,7a-tetrahyd
ro-2-hydroxy-1-phenyl- 3H-pyrrolizin-3-one. The IC50 of phenopyrrozin
against lipid peroxidation induced by Cr2K2O7 was 73 mu g/ml. Phenopyr
rozin also reduced chromosomal aberrations induced by paraquat.