Biotransformation of agallochaexcoerin A by <i>Aspergillus flavus</i>

<div><p>Agallochaexcoerin A (<b>1</b>), a seco-manoyl oxide diterpenoid was metabolised by pathogenic fungus, <i>Aspergillus flavus</i>, in growth media to yield a new metabolite, termed agallochaexcoerin G (<b>2</b>). It was confirmed by using IR, UV, ¹H NMR and HR-ESI-MS techniques. This microbial bioconversion was achieved by unusual dehydration at C-4 position.</p>