It is produced by the strain of Paecilomyces lilacinus A-267. It's a peptide antibiotic. It has a strong anti-pathogenic and non-pathogenic yeast and fungi activity, but also has a medium anti-bacterial effect. It was previously reported that Leucinostatin A and B mixtures inhibited HeLa cells. 0.05 μg/mL of Leucinostatin B for a week (0.25 mg/kg・d) has inhibitory effect on the airy ascites carcinoma entity type, and for ascites type is invalid.