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Indirect photodegradation of N-Acetyl-DL-tryptophan (CAS 87-32-1) in air is not expected since the substance is not likely to be present in the atmosphere (vapour pressure = < 4.6E-10 hPa, 20 °C). Furthermore, experimental findings showed that the substance is hydrolytically stable at pH values ranging from 4 to 9. Moreover, the substance is rapidly biodegradable and is thus expected to be ultimately eliminated through biodegradation by microorganisms in aquatic and terrestrial environments.