New diketopiperazines from the entomopathogenic fungus Verticillium hemipterigenum BCC 1449

Two new diketopiperazines, bisdethiodi(methylthio)-1-demethylhyalodendrin and 1-demethylhyalodendrin tetrasulfide, together with two known cyclodepsipeptides, enniatins B and B4, and two known pyrones, pyrenocines A and B, were isolated from a culture broth of the entomopathogenic fungus Verticillium hemipterigenum BCC 1449. These structures were elucidated using spectroscopic methods and X-ray crystallography. Antimalarial and cytotoxic activities of these compounds were evaluated.