Val-Leu-Arg-p-nitroanilide

D-Val-Leu-Arg p-nitroanilide diacetate salt has been used as a substrate to determine the amidolytic activity of the fibrinolytic enzyme from Bacillus subtilis DC33. It has also been used as a substrate to determine the activity of fibrinolytic enzymes from the earthworm Eisenia fetida.