Tetramic Acid Analogues Produced by Coculture of <i>Saccharopolyspora erythraea </i>with<i> Fusarium pallidoroseum</i>

Coculture of the fungus <i>Fusarium pallidoroseum</i> with the bacterium <i>Saccharopolyspora erythraea</i> was found to produce three new decalin-type tetramic acid analogues related to equisetin. The structures were determined by spectroscopic methods. The absolute configurations were established by circular dichroism spectroscopy and comparing the data with those of equisetin