Tricycloalternarenes produced by Alternaria alternata related to ACTG-toxins

Abstract Ten metabolites, named tricycloalternarenes, were isolated from the culture filtrate of the phytopathogenic fungus, Alternaria alternata , and their structures elucidated by spectroscopic methods. Seven compounds are described for the first time. Tricycloalternarenes related to the ACTG-toxins from A. citri cannot be denoted as host-specific toxins.