Ten metabolites, named tricycloalternarenes, were is elated from the c
ulture filtrate of the phytopathogenic fungus, Alternaria alternata, a
nd their structures elucidated by spectroscopic methods. Seven compoun
ds are described for the first time. Tricycloalternarenes related to t
he ACTG-toxins from A. citri cannot be denoted as host-specific toxins
. (C) 1997 Elsevier Science Ltd.