Oscillamide Y

Oscillamide Y (Compound 1) is a urea-containing cyclic peptide that acts as a chymotrypsin inhibitor. This compound can be isolated from the freshwater toxic cyanobacterium Oscillatoria agardhii. It exhibits strong toxicity towards fish, large water fleas, and algae and stimulates Raphidocelis subcapitata with an EC50 of 4.62 mg/L. Additionally, Oscillamide Y highly inhibits the luminescence of Aliivibrio fischeri and is useful in ecological development research.