Holomycin (N-Demethylthiolutin) is a secondary metabolite of dithiopyrrolidone. HolomycinHolomycin, an antibiotic secondary metabolite, is required for the biofilm formation of natural photogenic Bacillus galatheae S2753 and is also a broad-spectrum antibiotic. holomycin promotes biofilm formation of S2753 through its alene-disthionyl group. Holomycin has antitumor activity and is involved in RNA synthesis.