A diketopiperazine metabolite; active against VRE strains of E. faecalis including K-99-34, K-00-184, and K-00-221 (MICs = 12.5 μg/ml); inhibits growth of K562, HL-60, and U937 leukemia cells (1-100 μg/ml); has antifouling activity, inhibiting attachment of B. amphitrite larva (EC50 = 0.15 mM)