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Acute aquatic toxicity data of amides, C16-18(even-numbered), N, N-bis(hydroxyethyl) and structurally similar substances are available for three trophic levels. The L(E)C50values are consistently within a range of approximately 1-10 mg/L. Long-term aquatic toxicity data are also available, the lowest NOEC was 0.07 mg/L based on a 21 day reproduction study inDaphnia magna.