BE 24566B is a polyketide fungal metabolite originally isolated from S. violaceusniger. It is active against B. subtilis, B. cereus, S. aureus, M. luteus, E. faecalis, and S. thermophilus (MICs=1.56, 1.56, 1.56, 1.56, 3.13, and 3.13 μg/mL, respectively). BE 24566B is an endothelin (ET) receptor antagonist (IC50s=11 and 3.9 μM for ETA and ETB receptors, respectively).