A bacterial metabolite; active against Gram-positive bacteria, including several strains of S. aureus (MICs = 0.39-0.78 μg/ml), two strains of MRSA (MICs = 0.39 and 0.78 μg/ml), as well as M. luteus, B. subtilis, and C. bovis (MICs = 0.78, 0.78, and 6.25 μg/ml, respectively)