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Reliable acute toxicity tests results are available for freshwater fish (Brachydanio rerio), invertebrates (Daphnia magna) and algae (Scenedesmus subspicatus (new name: Desmodesmus subspicatus)). LC50 or EC50 values for the three organisms expressed in terms of nominal concentrations were >100, 314.1 and 611 mg/l respectively. A NOEC of 75 mg/l was determined in the algal test. It is likely that under the test conditions the test organisms were primarily exposed to the hydrolysis products of the substance.