PD 116152 is a new, highly substituted phenazine with antitumor activity was isolated from the culture broth of a Streptomyces sp. It is a novel phenazine antitumor antibiotic. The antibiotic is selectively active versus the bacterium Streptococcus pneumoniae (MIC less than 0.46 microgram/ml); the antitumor activity versus murine P388 leukemia is T/C 149.
