A diketopiperazine metabolite; induces formation of weeping necrotic lesions in leaves of spotted knapweed (10 μM); reduces growth of the plant pathogenic bacteria X. axonopodis and R. solanacearum (MICs = 31.25 μg/ml) as well as pathogenic oomycetes (10-100 mg/ml); inhibits the growth of M. luteus, M. smegmatis, S. cerevisiae, C. albicans, C. neoformans, and A. niger when used in combination with pyrrolnitrin or banegasin,